Alright, let's work through 4821 times 7578 step by step
4821 × 7578 = 7578 × (4821)
+ 7578 × 1 producing 7578
+ 7578 × 20 producing 151560
+ 7578 × 800 what gives us 6062400
+ 7578 × 4000 giving us 30312000

= 36533538
