CREATE TABLE table_39066 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" TEXT)

What was the highest week with 84,856 in attendance?
SELECT MAX("Week") FROM table_39066 WHERE "Attendance" = '84,856'
SELECT MAX("Week") FROM "table_39066" WHERE "Attendance" = '84,856'