Alright, let's work through 1931 times 4220 step by step
1931 × 4220 = 4220 × (1931)
+ 4220 × 1 giving us 4220
+ 4220 × 30 that results in 126600
+ 4220 × 900 which equals 3798000
+ 4220 × 1000 what gives us 4220000

= 8148820
