How to pivot on multiple columns in SQL Server? What is the best way to 'flatten' tables into a single row?

For example, with the following table:

+-----+-------+-------------+------------------+
| Id  | hProp | iDayOfMonth | dblTargetPercent |
+-----+-------+-------------+------------------+
| 117 |    10 |           5 |           0.1400 |
| 118 |    10 |          10 |           0.0500 |
| 119 |    10 |          15 |           0.0100 |
| 120 |    10 |          20 |           0.0100 |
+-----+-------+-------------+------------------+


I would like to produce the following table:

+-------+--------------+-------------------+--------------+-------------------+--------------+-------------------+--------------+-------------------+
| hProp | iDateTarget1 | dblPercentTarget1 | iDateTarget2 | dblPercentTarget2 | iDateTarget3 | dblPercentTarget3 | iDateTarget4 | dblPercentTarget4 |
+-------+--------------+-------------------+--------------+-------------------+--------------+-------------------+--------------+-------------------+
|    10 |            5 |              0.14 |           10 |              0.05 |           15 |              0.01 |           20 |              0.01 |
+-------+--------------+-------------------+--------------+-------------------+--------------+-------------------+--------------+-------------------+


I have managed to do this using a pivot and then rejoining to the original table several times, but I'm fairly sure there is a better way. This works as expected:

select
X0.hProp,
X0.iDateTarget1,
X1.dblTargetPercent [dblPercentTarget1],
X0.iDateTarget2,
X2.dblTargetPercent [dblPercentTarget2],
X0.iDateTarget3,
X3.dblTargetPercent [dblPercentTarget3],
X0.iDateTarget4,
X4.dblTargetPercent [dblPercentTarget4]
from (
    select
        hProp,
        max([1]) [iDateTarget1],
        max([2]) [iDateTarget2],
        max([3]) [iDateTarget3],
        max([4]) [iDateTarget4]
    from (
        select
            *,
            rank() over (partition by hProp order by iWeek) rank#
        from [Table X]
    ) T
    pivot (max(iWeek) for rank# in ([1],[2],[3], [4])) pv
    group by hProp
) X0
left join [Table X] X1 on X1.hprop = X0.hProp and X1.iWeek = X0.iDateTarget1
left join [Table X] X2 on X2.hprop = X0.hProp and X2.iWeek = X0.iDateTarget2
left join [Table X] X3 on X3.hprop = X0.hProp and X3.iWeek = X0.iDateTarget3
left join [Table X] X4 on X4.hprop = X0.hProp and X4.iWeek = X0.iDateTarget4
Here is one way of getting the result set you want without doing the multiple joins.  It takes a little more setup and uses two pivot operations instead of one, but avoids the multiple joins.  

I admit that I had to look it up, but Ken O'Bonn had a great article.  https://blogs.msdn.microsoft.com/kenobonn/2009/03/22/pivot-on-two-or-more-fields-in-sql-server/

/** Build up a Table to work with. **/
DECLARE @T TABLE
    (
    ID INT NOT NULL PRIMARY KEY
    , hProp INT NOT NULL
    , iDayOfMonth INT NOT NULL
    , dblTargetPercent DECIMAL(6,4) NOT NULL
    )

INSERT INTO @T
(ID, hProp, iDayOfMonth, dblTargetPercent)
VALUES (117,10,5,0.1400)
        , (118, 10, 10, 0.0500) 
        , (119, 10, 15, 0.0100)
        , (120, 10, 20, 0.0100)

/** Create a CTE and give us predictable names to work with for
    date and percentage
    **/
;WITH CTE_Rank AS
    (
    SELECT ID
        , hProp
        , iDayOfMonth 
        , dblTargetPercent 
        , sDateName = 'iDateTarget' + CAST(DENSE_RANK() OVER (PARTITION BY hPRop ORDER BY iDayOfMonth) AS VARCHAR(10))
        , sPercentName = 'dblPercentTarget' + CAST(DENSE_RANK() OVER (PARTITION BY hPRop ORDER BY iDayOfMonth) AS VARCHAR(10))
    FROM @T
    )
SELECT hProp 
    , iDateTarget1 = MAX(iDateTarget1)
    , dblPercentTarget1 = MAX(dblPercentTarget1)
    , iDateTarget2 = MAX(iDateTarget2)
    , dblPercentTarget2 = MAX(dblPercentTarget2)
    , iDateTarget3 = MAX(iDateTarget3)
    , dblPercentTarget3 = MAX(dblPercentTarget3)
    , iDateTarget4 = MAX(iDateTarget4)
    , dblPercentTarget4 = MAX(dblPercentTarget4)
FROM CTE_Rank AS R
    PIVOT(MAX(iDayOfMonth) FOR sDateName IN ([iDateTarget1], [iDateTarget2], [iDateTarget3], [iDateTarget4])) AS DayOfMonthName 
    PIVOT(MAX(dblTargetPercent) FOR sPercentName IN (dblPercentTarget1, dblPercentTarget2, dblPercentTarget3, dblPercentTarget4)) AS TargetPercentName
GROUP BY hProp