Alright, let's work through 4992 times 7890 step by step
4992 × 7890 = 7890 × (4992)
+ 7890 × 2 which equals 15780
+ 7890 × 90 resulting in 710100
+ 7890 × 900 that results in 7101000
+ 7890 × 4000 producing 31560000

= 39386880
