Alright, let's work through 3158 times 8607 step by step
3158 × 8607 = 8607 × (3158)
+ 8607 × 8 giving us 68856
+ 8607 × 50 resulting in 430350
+ 8607 × 100 producing 860700
+ 8607 × 3000 which equals 25821000

= 27180906
