CREATE TABLE table_29486 ("No. in Series" FLOAT, "No. in Season" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "U.S. viewers  ( millions ) " CLOB)

What's the highest season number with a series number of 47?
SELECT MAX("No. in Season") FROM table_29486 WHERE "No. in Series" = '47'
SELECT MAX("No. in Season") FROM "table_29486" WHERE "No. in Series" = '47'