Alright, let's work through 2864 times 1215 step by step
2864 × 1215 = 1215 × (2864)
+ 1215 × 4 resulting in 4860
+ 1215 × 60 that is equal 72900
+ 1215 × 800 that equals 972000
+ 1215 × 2000 giving us 2430000

= 3479760
