Alright, let's work through 2788 times 7860 step by step
2788 × 7860 = 7860 × (2788)
+ 7860 × 8 giving us 62880
+ 7860 × 80 producing 628800
+ 7860 × 700 giving us 5502000
+ 7860 × 2000 that equals 15720000

= 21913680
