363909 ÷ 86 
Our goal is to divide 363909 by 86.

Going ahead to step 1:
If we divide 3 by 86, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 86

Let's proceed to step 2:
86 can be fit into 36 0 times, resulting in a remainder of 36.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 36, we get 36.
Append the next digit (3) from the dividend to 36 and continue with: 363 / 86

On to step 3:
When dividing 363 by 86, we get 4 with a remainder of 19.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 344 from 363 and we're left with 19.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 86

Moving on to step 4:
86 goes into 199 2 times with a remainder of 27.
Put 2 as the next digit of the answer. 
Result so far: 42.0
Deduct 172 from 199 and we're left with 27.
Append the next digit (0) from the dividend to 27 and continue with: 270 / 86

Going ahead to step 5:
86 goes into 270 3 times with a remainder of 12.
The next digit of our result is 3. 
Result so far: 423.0
If we subtract 258 from 270, we get 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 86

Step 6:
86 can be fit into 129 1 times, resulting in a remainder of 43.
Write down 1 as next digit of the result. 
Result so far: 4231.0
Deduct 86 from 129 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 7:
86 can be fit into 430 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 4231.5
Subtracting 430 from 430 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.

Advancing to step 8:
The number 86 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4231.5
Subtracting 0 from 0 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.

Step 9:
0 divided by 86 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 4231.5
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.

Our division results in 4231.5 with a remaining 0.0.