Alright, let's work through 3758 times 5115 step by step
3758 × 5115 = 5115 × (3758)
+ 5115 × 8 resulting in 40920
+ 5115 × 50 that equals 255750
+ 5115 × 700 yielding 3580500
+ 5115 × 3000 that is equal 15345000

= 19222170
