69619536 ÷ 129 
Our goal is to divide 69619536 by 129.

Let's proceed to step 1:
6 divided by 129 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (9) from the dividend, add it to 6, then carry on: 69 / 129

On to step 2:
129 goes into 69 0 times with a remainder of 69.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 69 leaves us with 69.
Take the next digit (6) from the dividend and append it to 69, then repeat: 696 / 129

Advancing to step 3:
129 goes into 696 5 times with a remainder of 51.
The next digit of our result is 5. 
Result so far: 5.0
Subtracting 645 from 696 leaves us with 51.
Bring next digit (1) of the dividend behind the 51 and repeat the process: 511 / 129

Let's proceed to step 4:
129 goes into 511 3 times with a remainder of 124.
The next digit of our result is 3. 
Result so far: 53.0
Subtracting 387 from 511 leaves us with 124.
Grab the next digit (9) from the dividend, add it to 124, then carry on: 1249 / 129

Moving on to step 5:
When dividing 1249 by 129, we get 9 with a remainder of 88.
Put 9 as the next digit of the answer. 
Result so far: 539.0
Deduct 1161 from 1249 and we're left with 88.
Fetch the next digit (5) from the dividend, attach it to 88 and continue: 885 / 129

Step 6:
885 divided by 129 is 6 with a remainder of 111.
Put 6 as the next digit of the answer. 
Result so far: 5396.0
If we subtract 774 from 885, we get 111.
Grab the next digit (3) from the dividend, add it to 111, then carry on: 1113 / 129

Going ahead to step 7:
129 goes into 1113 8 times with a remainder of 81.
Use 8 as the next digit of our solution. 
Result so far: 53968.0
If we take 1032 away from 1113, we end up with 81.
Append the next digit (6) from the dividend to 81 and continue with: 816 / 129

Advancing to step 8:
The number 129 fits into 816 6 times, leaving a remainder of 42.
Use 6 as the next digit of our solution. 
Result so far: 539686.0
The remainder is 42 after subtracting 774 from 816.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 9:
The number 129 fits into 420 3 times, leaving a remainder of 33.
The next digit of our result is 3. 
Result so far: 539686.3
If we subtract 387 from 420, we get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 10:
The number 129 fits into 330 2 times, leaving a remainder of 72.
The number 2 becomes the next digit in our result. 
Result so far: 539686.32
If we subtract 258 from 330, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 11:
When dividing 720 by 129, we get 5 with a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 539686.325
The remainder is 75 after subtracting 645 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 12:
If we divide 750 by 129, we get 5 and a remainder of 105.
Use 5 as the next digit of our solution. 
Result so far: 539686.3255
If we take 645 away from 750, we end up with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

The final outcome is 539686.3255, with a leftover of 0.00105.