CREATE TABLE table_29376 ("No. in Series" FLOAT, "No. in Season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

What is the highest series number with 9.17 million US viewers?
SELECT MAX("No. in Series") FROM table_29376 WHERE "U.S. viewers (millions)" = '9.17'
SELECT MAX("No. in Series") FROM "table_29376" WHERE "U.S. viewers (millions)" = '9.17'