We're dividing 321129 by 84 
We're looking to find how many times 84 goes into 321129.

Let's proceed to step 1:
3 divided by 84 is 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 84

Moving on to step 2:
84 can be fit into 32 0 times, resulting in a remainder of 32.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 32 and we're left with 32.
Include the next digit (1) from the dividend after 32, then repeat: 321 / 84

On to step 3:
84 can be fit into 321 3 times, resulting in a remainder of 69.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtract 252 from 321 to get 69.
Bring next digit (1) of the dividend behind the 69 and repeat the process: 691 / 84

Step 4:
The number 84 fits into 691 8 times, leaving a remainder of 19.
Put 8 as the next digit of the answer. 
Result so far: 38.0
Deduct 672 from 691 and we're left with 19.
Grab the next digit (2) from the dividend, add it to 19, then carry on: 192 / 84

On to step 5:
The number 84 fits into 192 2 times, leaving a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 382.0
If we subtract 168 from 192, we get 24.
Fetch the next digit (9) from the dividend, attach it to 24 and continue: 249 / 84

On to step 6:
When dividing 249 by 84, we get 2 with a remainder of 81.
Use 2 as the next digit of our solution. 
Result so far: 3822.0
Deduct 168 from 249 and we're left with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Let's proceed to step 7:
When dividing 810 by 84, we get 9 with a remainder of 54.
The next digit of our result is 9. 
Result so far: 3822.9
The remainder is 54 after subtracting 756 from 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 8:
If we divide 540 by 84, we get 6 and a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 3822.96
Subtracting 504 from 540 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 9:
If we divide 360 by 84, we get 4 and a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 3822.964
If we take 336 away from 360, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 10:
The number 84 fits into 240 2 times, leaving a remainder of 72.
Record the quotient 2 as the next digit in the result. 
Result so far: 3822.9642
The remainder is 72 after subtracting 168 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 11:
If we divide 720 by 84, we get 8 and a remainder of 48.
Record the quotient 8 as the next digit in the result. 
Result so far: 3822.96428
The remainder is 48 after subtracting 672 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 12:
480 divided by 84 is 5 with a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 3822.964285
Subtracting 420 from 480 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 13:
If we divide 600 by 84, we get 7 and a remainder of 12.
The next digit of our result is 7. 
Result so far: 3822.9642857
If we subtract 588 from 600, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 14:
The number 84 fits into 120 1 times, leaving a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 3822.96428571
Deduct 84 from 120 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final result is 3822.96428571 with a remainder of 3.6e-08.