We look at the division of 381087 by 90 
We're looking to find how many times 90 goes into 381087.

Advancing to step 1:
3 divided by 90 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.
Bring next digit (8) of the dividend behind the 3 and repeat the process: 38 / 90

Let's proceed to step 2:
When dividing 38 by 90, we get 0 with a remainder of 38.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 38 after subtracting 0 from 38.
Take the next digit (1) from the dividend and append it to 38, then repeat: 381 / 90

Advancing to step 3:
When dividing 381 by 90, we get 4 with a remainder of 21.
The next digit of our result is 4. 
Result so far: 4.0
If we take 360 away from 381, we end up with 21.
Append the next digit (0) from the dividend to 21 and continue with: 210 / 90

Step 4:
90 goes into 210 2 times with a remainder of 30.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
The remainder is 30 after subtracting 180 from 210.
Append the next digit (8) from the dividend to 30 and continue with: 308 / 90

Going ahead to step 5:
308 divided by 90 is 3 with a remainder of 38.
The next digit of our result is 3. 
Result so far: 423.0
If we subtract 270 from 308, we get 38.
Fetch the next digit (7) from the dividend, attach it to 38 and continue: 387 / 90

On to step 6:
90 can be fit into 387 4 times, resulting in a remainder of 27.
Put 4 as the next digit of the answer. 
Result so far: 4234.0
Subtracting 360 from 387 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 7:
270 divided by 90 is 3 with a remainder of 0.
Record the quotient 3 as the next digit in the result. 
Result so far: 4234.3
If we subtract 270 from 270, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
If we divide 0 by 90, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4234.3
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 90 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 4234.3
Deduct 0 from 0 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.

The final outcome is 4234.3, with a leftover of 0.0.