Alright, let's work through 1891 times 9157 step by step
1891 × 9157 = 9157 × (1891)
+ 9157 × 1 producing 9157
+ 9157 × 90 giving us 824130
+ 9157 × 800 that is equal 7325600
+ 9157 × 1000 giving us 9157000

= 17315887
