We look at the division of 38139 by 90 
We're looking to find how many times 90 goes into 38139.

Advancing to step 1:
3 divided by 90 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 90

Going ahead to step 2:
38 divided by 90 is 0 with a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 38 to get 38.
Bring next digit (1) of the dividend behind the 38 and repeat the process: 381 / 90

Advancing to step 3:
If we divide 381 by 90, we get 4 and a remainder of 21.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 360 from 381 leaves us with 21.
Grab the next digit (3) from the dividend, add it to 21, then carry on: 213 / 90

Moving on to step 4:
90 can be fit into 213 2 times, resulting in a remainder of 33.
Use 2 as the next digit of our solution. 
Result so far: 42.0
The remainder is 33 after subtracting 180 from 213.
Append the next digit (9) from the dividend to 33 and continue with: 339 / 90

On to step 5:
When dividing 339 by 90, we get 3 with a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 423.0
The remainder is 69 after subtracting 270 from 339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 6:
If we divide 690 by 90, we get 7 and a remainder of 60.
Record the quotient 7 as the next digit in the result. 
Result so far: 423.7
The remainder is 60 after subtracting 630 from 690.
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 7:
600 divided by 90 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 423.76
Subtract 540 from 600 to get 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:
90 goes into 600 6 times with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 423.766
Subtracting 540 from 600 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.

Our division results in 423.766 with a remaining 0.006.