Alright, let's work through 1155 times 8139 step by step
1155 × 8139 = 8139 × (1155)
+ 8139 × 5 resulting in 40695
+ 8139 × 50 that is equal 406950
+ 8139 × 100 what gives us 813900
+ 8139 × 1000 yielding 8139000

= 9400545
