We're dividing 321891 by 75 
Our goal is to divide 321891 by 75.

On to step 1:
When dividing 3 by 75, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (2) from the dividend after 3, then repeat: 32 / 75

Moving on to step 2:
If we divide 32 by 75, we get 0 and a remainder of 32.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 32 leaves us with 32.
Take the next digit (1) from the dividend and append it to 32, then repeat: 321 / 75

Advancing to step 3:
75 goes into 321 4 times with a remainder of 21.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 300 from 321, we get 21.
Include the next digit (8) from the dividend after 21, then repeat: 218 / 75

Step 4:
The number 75 fits into 218 2 times, leaving a remainder of 68.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
Subtract 150 from 218 to get 68.
Bring next digit (9) of the dividend behind the 68 and repeat the process: 689 / 75

Step 5:
689 divided by 75 is 9 with a remainder of 14.
The next digit of our result is 9. 
Result so far: 429.0
The remainder is 14 after subtracting 675 from 689.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 75

Moving on to step 6:
The number 75 fits into 141 1 times, leaving a remainder of 66.
Put 1 as the next digit of the answer. 
Result so far: 4291.0
If we take 75 away from 141, we end up with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 7:
75 can be fit into 660 8 times, resulting in a remainder of 60.
Use 8 as the next digit of our solution. 
Result so far: 4291.8
Subtracting 600 from 660 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.

On to step 8:
When dividing 600 by 75, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 4291.88
Deduct 600 from 600 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 4291.88 with a remaining 0.0.