Alright, let's work through 7678 times 1287 step by step
7678 × 1287 = 1287 × (7678)
+ 1287 × 8 that is equal 10296
+ 1287 × 70 yielding 90090
+ 1287 × 600 that equals 772200
+ 1287 × 7000 yielding 9009000

= 9881586
