Alright, let's work through 5154 times 778 step by step
5154 × 778 = 778 × (5154)
+ 778 × 4 producing 3112
+ 778 × 50 producing 38900
+ 778 × 100 giving us 77800
+ 778 × 5000 giving us 3890000

= 4009812
