Alright, let's work through 8779 times 9489 step by step
8779 × 9489 = 9489 × (8779)
+ 9489 × 9 producing 85401
+ 9489 × 70 that is equal 664230
+ 9489 × 700 resulting in 6642300
+ 9489 × 8000 producing 75912000

= 83303931
