Alright, let's work through 6804 times 573 step by step
6804 × 573 = 573 × (6804)
+ 573 × 4 giving us 2292
+ 573 × 00 yielding 0
+ 573 × 800 what gives us 458400
+ 573 × 6000 yielding 3438000

= 3898692
