Let's divide 403631 by 4
We want to divide 403631 by 4.

Step 1:
The number 4 fits into 4 1 times, leaving a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 4 from 4 to get 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 4

Let's proceed to step 2:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 0 to get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 4

On to step 3:
When dividing 3 by 4, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 100.0
If we subtract 0 from 3, we get 3.
Include the next digit (6) from the dividend after 3, then repeat: 36 / 4

On to step 4:
4 can be fit into 36 9 times, resulting in a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 1009.0
Subtract 36 from 36 to get 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 4

On to step 5:
If we divide 3 by 4, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 10090.0
If we subtract 0 from 3, we get 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 4

Moving on to step 6:
The number 4 fits into 31 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 100907.0
Subtracting 28 from 31 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
If we divide 30 by 4, we get 7 and a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 100907.7
Subtracting 28 from 30 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 8:
4 can be fit into 20 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 100907.75
The remainder is 0 after subtracting 20 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 100907.75
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 100907.75
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.

The final result is 100907.75 with a remainder of 0.0.