Alright, let's work through 1878 times 1920 step by step
1878 × 1920 = 1920 × (1878)
+ 1920 × 8 that is equal 15360
+ 1920 × 70 which equals 134400
+ 1920 × 800 which equals 1536000
+ 1920 × 1000 giving us 1920000

= 3605760
