728350 divided by 21 
Our goal is to divide 728350 by 21.

Let's proceed to step 1:
If we divide 7 by 21, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 21

Moving on to step 2:
21 can be fit into 72 3 times, resulting in a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 63 from 72, we get 9.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 21

Let's proceed to step 3:
21 goes into 98 4 times with a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
Subtract 84 from 98 to get 14.
Append the next digit (3) from the dividend to 14 and continue with: 143 / 21

Step 4:
21 goes into 143 6 times with a remainder of 17.
Put 6 as the next digit of the answer. 
Result so far: 346.0
Subtracting 126 from 143 leaves us with 17.
Bring next digit (5) of the dividend behind the 17 and repeat the process: 175 / 21

Moving on to step 5:
21 goes into 175 8 times with a remainder of 7.
The next digit of our result is 8. 
Result so far: 3468.0
If we take 168 away from 175, we end up with 7.
Grab the next digit (0) from the dividend, add it to 7, then carry on: 70 / 21

Moving on to step 6:
21 can be fit into 70 3 times, resulting in a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 34683.0
If we subtract 63 from 70, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
The number 21 fits into 70 3 times, leaving a remainder of 7.
Put 3 as the next digit of the answer. 
Result so far: 34683.3
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 8:
When dividing 70 by 21, we get 3 with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 34683.33
Deduct 63 from 70 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The final outcome is 34683.33, with a leftover of 0.007.