Alright, let's work through 8724 times 9640 step by step
8724 × 9640 = 9640 × (8724)
+ 9640 × 4 that equals 38560
+ 9640 × 20 producing 192800
+ 9640 × 700 that results in 6748000
+ 9640 × 8000 resulting in 77120000

= 84099360
