Alright, let's work through 2781 times 391 step by step
2781 × 391 = 391 × (2781)
+ 391 × 1 yielding 391
+ 391 × 80 that is equal 31280
+ 391 × 700 producing 273700
+ 391 × 2000 yielding 782000

= 1087371
