There are eight numbers in a row, their average is 9.3, the average of the first five numbers is 10.5, the average of the last four numbers is 11.3, so the sum of these eight numbers is___ The fifth number is___ .

There are eight numbers in a row, their average is 9.3, the average of the first five numbers is 10.5, the average of the last four numbers is 11.3, so the sum of these eight numbers is___ The fifth number is___ .

(1) 9.3 × 8 = 74.4; (2) 10.5 × 5 + 11.3 × 4-74.4, = 52.5 + 45.2-74.4, = 97.7-74.4, = 23.3