We're going to solve 1287 multiplied by 3072
1287 × 3072 = 3072 × (1287)
+ 3072 × 7 that is equal 21504
+ 3072 × 80 that is equal 245760
+ 3072 × 200 that is equal 614400
+ 3072 × 1000 that is equal 3072000

= 3953664
