Alright, let's work through 4245 times 1172 step by step
4245 × 1172 = 1172 × (4245)
+ 1172 × 5 resulting in 5860
+ 1172 × 40 that results in 46880
+ 1172 × 200 what gives us 234400
+ 1172 × 4000 that equals 4688000

= 4975140
