Alright, let's work through 8507 times 9813 step by step
8507 × 9813 = 9813 × (8507)
+ 9813 × 7 producing 68691
+ 9813 × 00 that equals 0
+ 9813 × 500 that equals 4906500
+ 9813 × 8000 yielding 78504000

= 83479191
