Alright, let's work through 1138 times 2789 step by step
1138 × 2789 = 2789 × (1138)
+ 2789 × 8 yielding 22312
+ 2789 × 30 yielding 83670
+ 2789 × 100 yielding 278900
+ 2789 × 1000 that results in 2789000

= 3173882
