31261544 ÷ 129 
Let's see how many times 129 fits into 31261544.

On to step 1:
129 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 129

Let's proceed to step 2:
When dividing 31 by 129, we get 0 with a remainder of 31.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 31 leaves us with 31.
Fetch the next digit (2) from the dividend, attach it to 31 and continue: 312 / 129

On to step 3:
When dividing 312 by 129, we get 2 with a remainder of 54.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 258 away from 312, we end up with 54.
Bring next digit (6) of the dividend behind the 54 and repeat the process: 546 / 129

Advancing to step 4:
When dividing 546 by 129, we get 4 with a remainder of 30.
Use 4 as the next digit of our solution. 
Result so far: 24.0
If we take 516 away from 546, we end up with 30.
Take the next digit (1) from the dividend and append it to 30, then repeat: 301 / 129

Advancing to step 5:
If we divide 301 by 129, we get 2 and a remainder of 43.
Use 2 as the next digit of our solution. 
Result so far: 242.0
If we subtract 258 from 301, we get 43.
Append the next digit (5) from the dividend to 43 and continue with: 435 / 129

On to step 6:
129 can be fit into 435 3 times, resulting in a remainder of 48.
The next digit of our result is 3. 
Result so far: 2423.0
If we take 387 away from 435, we end up with 48.
Grab the next digit (4) from the dividend, add it to 48, then carry on: 484 / 129

Going ahead to step 7:
The number 129 fits into 484 3 times, leaving a remainder of 97.
Write down 3 as next digit of the result. 
Result so far: 24233.0
The remainder is 97 after subtracting 387 from 484.
Fetch the next digit (4) from the dividend, attach it to 97 and continue: 974 / 129

On to step 8:
974 divided by 129 is 7 with a remainder of 71.
Put 7 as the next digit of the answer. 
Result so far: 242337.0
If we take 903 away from 974, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 9:
The number 129 fits into 710 5 times, leaving a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 242337.5
If we take 645 away from 710, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 10:
129 can be fit into 650 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 242337.55
If we subtract 645 from 650, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 242337.55, with a leftover of 0.005.