We look at the division of 45705291 by 521 
We're looking to find how many times 521 goes into 45705291.

Advancing to step 1:
521 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 521

Advancing to step 2:
521 can be fit into 45 0 times, resulting in a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 45, we end up with 45.
Fetch the next digit (7) from the dividend, attach it to 45 and continue: 457 / 521

Going ahead to step 3:
The number 521 fits into 457 0 times, leaving a remainder of 457.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 457 and we're left with 457.
Take the next digit (0) from the dividend and append it to 457, then repeat: 4570 / 521

Step 4:
The number 521 fits into 4570 8 times, leaving a remainder of 402.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we subtract 4168 from 4570, we get 402.
Append the next digit (5) from the dividend to 402 and continue with: 4025 / 521

Advancing to step 5:
521 can be fit into 4025 7 times, resulting in a remainder of 378.
The number 7 becomes the next digit in our result. 
Result so far: 87.0
If we take 3647 away from 4025, we end up with 378.
Fetch the next digit (2) from the dividend, attach it to 378 and continue: 3782 / 521

On to step 6:
521 goes into 3782 7 times with a remainder of 135.
The number 7 becomes the next digit in our result. 
Result so far: 877.0
The remainder is 135 after subtracting 3647 from 3782.
Bring next digit (9) of the dividend behind the 135 and repeat the process: 1359 / 521

Let's proceed to step 7:
The number 521 fits into 1359 2 times, leaving a remainder of 317.
Use 2 as the next digit of our solution. 
Result so far: 8772.0
If we subtract 1042 from 1359, we get 317.
Fetch the next digit (1) from the dividend, attach it to 317 and continue: 3171 / 521

On to step 8:
If we divide 3171 by 521, we get 6 and a remainder of 45.
Use 6 as the next digit of our solution. 
Result so far: 87726.0
Subtracting 3126 from 3171 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 9:
521 can be fit into 450 0 times, resulting in a remainder of 450.
The number 0 becomes the next digit in our result. 
Result so far: 87726.0
If we take 0 away from 450, we end up with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

On to step 10:
521 goes into 4500 8 times with a remainder of 332.
Record the quotient 8 as the next digit in the result. 
Result so far: 87726.08
Subtract 4168 from 4500 to get 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Going ahead to step 11:
521 goes into 3320 6 times with a remainder of 194.
Put 6 as the next digit of the answer. 
Result so far: 87726.086
The remainder is 194 after subtracting 3126 from 3320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Step 12:
1940 divided by 521 is 3 with a remainder of 377.
Put 3 as the next digit of the answer. 
Result so far: 87726.0863
Deduct 1563 from 1940 and we're left with 377.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

On to step 13:
3770 divided by 521 is 7 with a remainder of 123.
Put 7 as the next digit of the answer. 
Result so far: 87726.08637
The remainder is 123 after subtracting 3647 from 3770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

On to step 14:
521 goes into 1230 2 times with a remainder of 188.
Record the quotient 2 as the next digit in the result. 
Result so far: 87726.086372
Deduct 1042 from 1230 and we're left with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

On to step 15:
521 goes into 1880 3 times with a remainder of 317.
Use 3 as the next digit of our solution. 
Result so far: 87726.0863723
Subtracting 1563 from 1880 leaves us with 317.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Advancing to step 16:
When dividing 3170 by 521, we get 6 with a remainder of 44.
Use 6 as the next digit of our solution. 
Result so far: 87726.08637236
The remainder is 44 after subtracting 3126 from 3170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final outcome is 87726.08637236, with a leftover of 4.4e-08.