We're dividing 45395886 by 391 
We want to divide 45395886 by 391.

Step 1:
If we divide 4 by 391, we get 0 and a remainder of 4.
The next digit of our result is 0. 
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 / 391

Moving on to step 2:
391 can be fit into 45 0 times, resulting in a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 45 leaves us with 45.
Grab the next digit (3) from the dividend, add it to 45, then carry on: 453 / 391

Moving on to step 3:
If we divide 453 by 391, we get 1 and a remainder of 62.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 391 from 453, we get 62.
Grab the next digit (9) from the dividend, add it to 62, then carry on: 629 / 391

Moving on to step 4:
When dividing 629 by 391, we get 1 with a remainder of 238.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 238 after subtracting 391 from 629.
Append the next digit (5) from the dividend to 238 and continue with: 2385 / 391

On to step 5:
2385 divided by 391 is 6 with a remainder of 39.
Record the quotient 6 as the next digit in the result. 
Result so far: 116.0
If we take 2346 away from 2385, we end up with 39.
Fetch the next digit (8) from the dividend, attach it to 39 and continue: 398 / 391

Moving on to step 6:
398 divided by 391 is 1 with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1161.0
If we take 391 away from 398, we end up with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 391

Advancing to step 7:
391 can be fit into 78 0 times, resulting in a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 11610.0
Subtract 0 from 78 to get 78.
Grab the next digit (6) from the dividend, add it to 78, then carry on: 786 / 391

Going ahead to step 8:
391 goes into 786 2 times with a remainder of 4.
The next digit of our result is 2. 
Result so far: 116102.0
If we take 782 away from 786, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
The number 391 fits into 40 0 times, leaving a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 116102.0
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 10:
If we divide 400 by 391, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 116102.01
Subtract 391 from 400 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 11:
When dividing 90 by 391, we get 0 with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 116102.01
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Step 12:
391 can be fit into 900 2 times, resulting in a remainder of 118.
Put 2 as the next digit of the answer. 
Result so far: 116102.0102
If we subtract 782 from 900, we get 118.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1180, and continue the process.

Step 13:
The number 391 fits into 1180 3 times, leaving a remainder of 7.
The next digit of our result is 3. 
Result so far: 116102.01023
If we subtract 1173 from 1180, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 14:
70 divided by 391 is 0 with a remainder of 70.
Put 0 as the next digit of the answer. 
Result so far: 116102.01023
The remainder is 70 after subtracting 0 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 15:
391 can be fit into 700 1 times, resulting in a remainder of 309.
Put 1 as the next digit of the answer. 
Result so far: 116102.0102301
If we subtract 391 from 700, we get 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

Going ahead to step 16:
If we divide 3090 by 391, we get 7 and a remainder of 353.
Write down 7 as next digit of the result. 
Result so far: 116102.01023017
Deduct 2737 from 3090 and we're left with 353.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3530, and continue the process.

The final outcome is 116102.01023017, with a leftover of 3.53e-07.