We look at the division of 45558143 by 721 
Let's see how many times 721 fits into 45558143.

On to step 1:
If we divide 4 by 721, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 721

Step 2:
If we divide 45 by 721, we get 0 and a remainder of 45.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 45 to get 45.
Grab the next digit (5) from the dividend, add it to 45, then carry on: 455 / 721

Advancing to step 3:
When dividing 455 by 721, we get 0 with a remainder of 455.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 455 after subtracting 0 from 455.
Include the next digit (5) from the dividend after 455, then repeat: 4555 / 721

Going ahead to step 4:
When dividing 4555 by 721, we get 6 with a remainder of 229.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 229 after subtracting 4326 from 4555.
Take the next digit (8) from the dividend and append it to 229, then repeat: 2298 / 721

Going ahead to step 5:
If we divide 2298 by 721, we get 3 and a remainder of 135.
Record the quotient 3 as the next digit in the result. 
Result so far: 63.0
Subtracting 2163 from 2298 leaves us with 135.
Append the next digit (1) from the dividend to 135 and continue with: 1351 / 721

Let's proceed to step 6:
721 goes into 1351 1 times with a remainder of 630.
Record the quotient 1 as the next digit in the result. 
Result so far: 631.0
Deduct 721 from 1351 and we're left with 630.
Take the next digit (4) from the dividend and append it to 630, then repeat: 6304 / 721

Let's proceed to step 7:
The number 721 fits into 6304 8 times, leaving a remainder of 536.
Use 8 as the next digit of our solution. 
Result so far: 6318.0
Subtract 5768 from 6304 to get 536.
Bring next digit (3) of the dividend behind the 536 and repeat the process: 5363 / 721

On to step 8:
The number 721 fits into 5363 7 times, leaving a remainder of 316.
Write down 7 as next digit of the result. 
Result so far: 63187.0
If we subtract 5047 from 5363, we get 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Advancing to step 9:
If we divide 3160 by 721, we get 4 and a remainder of 276.
Use 4 as the next digit of our solution. 
Result so far: 63187.4
Subtracting 2884 from 3160 leaves us with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

On to step 10:
The number 721 fits into 2760 3 times, leaving a remainder of 597.
The number 3 becomes the next digit in our result. 
Result so far: 63187.43
Subtract 2163 from 2760 to get 597.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5970, and continue the process.

Let's proceed to step 11:
5970 divided by 721 is 8 with a remainder of 202.
Use 8 as the next digit of our solution. 
Result so far: 63187.438
Subtract 5768 from 5970 to get 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

On to step 12:
The number 721 fits into 2020 2 times, leaving a remainder of 578.
Use 2 as the next digit of our solution. 
Result so far: 63187.4382
Deduct 1442 from 2020 and we're left with 578.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5780, and continue the process.

Let's proceed to step 13:
721 goes into 5780 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 63187.43828
The remainder is 12 after subtracting 5768 from 5780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 14:
If we divide 120 by 721, we get 0 and a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 63187.43828
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 15:
721 can be fit into 1200 1 times, resulting in a remainder of 479.
Write down 1 as next digit of the result. 
Result so far: 63187.4382801
If we take 721 away from 1200, we end up with 479.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4790, and continue the process.

Going ahead to step 16:
721 can be fit into 4790 6 times, resulting in a remainder of 464.
Use 6 as the next digit of our solution. 
Result so far: 63187.43828016
The remainder is 464 after subtracting 4326 from 4790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

The final outcome is 63187.43828016, with a leftover of 4.64e-07.