Alright, let's work through 1287 times 9539 step by step
1287 × 9539 = 9539 × (1287)
+ 9539 × 7 yielding 66773
+ 9539 × 80 resulting in 763120
+ 9539 × 200 that is equal 1907800
+ 9539 × 1000 that equals 9539000

= 12276693
