We divide 728421 by 4
We want to divide 728421 by 4.

Step 1:
The number 4 fits into 7 1 times, leaving a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 3 after subtracting 4 from 7.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 4

Let's proceed to step 2:
32 divided by 4 is 8 with a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
If we take 32 away from 32, we end up with 0.
Append the next digit (8) from the dividend to 0 and continue with: 8 / 4

Moving on to step 3:
8 divided by 4 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 182.0
Subtracting 8 from 8 leaves us with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 4

Let's proceed to step 4:
If we divide 4 by 4, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1821.0
If we subtract 4 from 4, we get 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 4

Let's proceed to step 5:
The number 4 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 18210.0
If we take 0 away from 2, we end up with 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 4

On to step 6:
The number 4 fits into 21 5 times, leaving a remainder of 1.
The number 5 becomes the next digit in our result. 
Result so far: 182105.0
Subtracting 20 from 21 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
If we divide 10 by 4, we get 2 and a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 182105.2
If we subtract 8 from 10, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
The number 4 fits into 20 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 182105.25
If we subtract 20 from 20, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
4 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 182105.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
0 divided by 4 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 182105.25
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 182105.25, and the remainder is 0.0.