user: Question: What was the attendance when they had a ranking of #4?
Columns: ['Date', 'Opponent#', 'Rank #', 'Site', 'Result', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['September 15', 'Minnesota', '3', 'Ohio Stadium • Columbus, OH', 'W56-7', '86,005']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Rank #" = '4';