Alright, let's work through 8178 times 3689 step by step
8178 × 3689 = 3689 × (8178)
+ 3689 × 8 that equals 29512
+ 3689 × 70 that results in 258230
+ 3689 × 100 that is equal 368900
+ 3689 × 8000 that results in 29512000

= 30168642
