Alright, let's work through 3688 times 1124 step by step
3688 × 1124 = 1124 × (3688)
+ 1124 × 8 that equals 8992
+ 1124 × 80 that results in 89920
+ 1124 × 600 that equals 674400
+ 1124 × 3000 that results in 3372000

= 4145312
