No problem, we've got 4392 and 5340 to multiply
4392 × 5340 = 5340 × (4392)
+ 5340 × 2 which equals 10680
+ 5340 × 90 that results in 480600
+ 5340 × 300 that equals 1602000
+ 5340 × 4000 yielding 21360000

= 23453280
