We look at the division of 54214236 by 129 
We want to figure out the number of times 54214236 can be divided by 129.

Moving on to step 1:
129 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 129

On to step 2:
When dividing 54 by 129, we get 0 with a remainder of 54.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 54 to get 54.
Include the next digit (2) from the dividend after 54, then repeat: 542 / 129

On to step 3:
129 can be fit into 542 4 times, resulting in a remainder of 26.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 516 from 542 leaves us with 26.
Append the next digit (1) from the dividend to 26 and continue with: 261 / 129

Let's proceed to step 4:
When dividing 261 by 129, we get 2 with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 42.0
Deduct 258 from 261 and we're left with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 129

Step 5:
129 goes into 34 0 times with a remainder of 34.
Use 0 as the next digit of our solution. 
Result so far: 420.0
If we subtract 0 from 34, we get 34.
Append the next digit (2) from the dividend to 34 and continue with: 342 / 129

Advancing to step 6:
342 divided by 129 is 2 with a remainder of 84.
Record the quotient 2 as the next digit in the result. 
Result so far: 4202.0
Subtracting 258 from 342 leaves us with 84.
Include the next digit (3) from the dividend after 84, then repeat: 843 / 129

Let's proceed to step 7:
When dividing 843 by 129, we get 6 with a remainder of 69.
The number 6 becomes the next digit in our result. 
Result so far: 42026.0
If we subtract 774 from 843, we get 69.
Include the next digit (6) from the dividend after 69, then repeat: 696 / 129

Going ahead to step 8:
129 can be fit into 696 5 times, resulting in a remainder of 51.
The number 5 becomes the next digit in our result. 
Result so far: 420265.0
Subtract 645 from 696 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 9:
129 goes into 510 3 times with a remainder of 123.
Put 3 as the next digit of the answer. 
Result so far: 420265.3
Deduct 387 from 510 and we're left with 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1230, and continue the process.

Advancing to step 10:
129 can be fit into 1230 9 times, resulting in a remainder of 69.
The number 9 becomes the next digit in our result. 
Result so far: 420265.39
If we subtract 1161 from 1230, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 11:
If we divide 690 by 129, we get 5 and a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 420265.395
The remainder is 45 after subtracting 645 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 12:
129 can be fit into 450 3 times, resulting in a remainder of 63.
Use 3 as the next digit of our solution. 
Result so far: 420265.3953
If we take 387 away from 450, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Going ahead to step 13:
129 can be fit into 630 4 times, resulting in a remainder of 114.
Write down 4 as next digit of the result. 
Result so far: 420265.39534
Subtract 516 from 630 to get 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Step 14:
129 goes into 1140 8 times with a remainder of 108.
The number 8 becomes the next digit in our result. 
Result so far: 420265.395348
If we subtract 1032 from 1140, we get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

On to step 15:
When dividing 1080 by 129, we get 8 with a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 420265.3953488
Subtract 1032 from 1080 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final result is 420265.3953488 with a remainder of 4.8e-07.