Alright, let's work through 3900 times 1163 step by step
3900 × 1163 = 1163 × (3900)
+ 1163 × 0 yielding 0
+ 1163 × 00 that results in 0
+ 1163 × 900 yielding 1046700
+ 1163 × 3000 resulting in 3489000

= 4535700
