Alright, let's work through 7863 times 1099 step by step
7863 × 1099 = 1099 × (7863)
+ 1099 × 3 producing 3297
+ 1099 × 60 giving us 65940
+ 1099 × 800 resulting in 879200
+ 1099 × 7000 that is equal 7693000

= 8641437
