CREATE TABLE table_26808178_3 (series__number NUMBER, us_viewers__millions_ VARCHAR2)

Which series # had 0.852 U.S. viewers(millions)?
SELECT MAX(series__number) FROM table_26808178_3 WHERE us_viewers__millions_ = "0.852"
SELECT MAX("series__number") FROM "table_26808178_3" WHERE "0.852" = "us_viewers__millions_"