521811 ÷ 4 
Let's see how many times 4 fits into 521811.

Going ahead to step 1:
When dividing 5 by 4, we get 1 with a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
If we take 4 away from 5, we end up with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 4

Going ahead to step 2:
4 can be fit into 12 3 times, resulting in a remainder of 0.
The next digit of our result is 3. 
Result so far: 13.0
Subtracting 12 from 12 leaves us with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 4

Let's proceed to step 3:
The number 4 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 130.0
If we take 0 away from 1, we end up with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 4

Advancing to step 4:
The number 4 fits into 18 4 times, leaving a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 1304.0
If we subtract 16 from 18, we get 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 4

Let's proceed to step 5:
4 goes into 21 5 times with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 13045.0
Subtract 20 from 21 to get 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 4

Moving on to step 6:
4 goes into 11 2 times with a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 130452.0
Subtracting 8 from 11 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.

On to step 7:
When dividing 30 by 4, we get 7 with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 130452.7
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.

On to step 8:
4 can be fit into 20 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 130452.75
If we take 20 away from 20, we end up 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.

Advancing to step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 130452.75
Subtracting 0 from 0 leaves us 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.

Advancing to step 10:
The number 4 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 130452.75
If we subtract 0 from 0, 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.

The final result is 130452.75 with a remainder of 0.0.