We look at the division of 378591 by 75 
Let's see how many times 75 fits into 378591.

On to step 1:
3 divided by 75 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 75

Let's proceed to step 2:
75 goes into 37 0 times with a remainder of 37.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 37 to get 37.
Append the next digit (8) from the dividend to 37 and continue with: 378 / 75

Advancing to step 3:
378 divided by 75 is 5 with a remainder of 3.
The next digit of our result is 5. 
Result so far: 5.0
Subtract 375 from 378 to get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 75

On to step 4:
75 goes into 35 0 times with a remainder of 35.
Write down 0 as next digit of the result. 
Result so far: 50.0
The remainder is 35 after subtracting 0 from 35.
Take the next digit (9) from the dividend and append it to 35, then repeat: 359 / 75

Moving on to step 5:
The number 75 fits into 359 4 times, leaving a remainder of 59.
Write down 4 as next digit of the result. 
Result so far: 504.0
Subtracting 300 from 359 leaves us with 59.
Bring next digit (1) of the dividend behind the 59 and repeat the process: 591 / 75

Moving on to step 6:
591 divided by 75 is 7 with a remainder of 66.
The next digit of our result is 7. 
Result so far: 5047.0
Subtracting 525 from 591 leaves us 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:
When dividing 660 by 75, we get 8 with a remainder of 60.
The number 8 becomes the next digit in our result. 
Result so far: 5047.8
Deduct 600 from 660 and we're left 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.

Moving on to step 8:
The number 75 fits into 600 8 times, leaving a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 5047.88
Subtracting 600 from 600 leaves us 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 5047.88 with a remaining 0.0.