We look at the division of 351213 by 86 
We're looking to find how many times 86 goes into 351213.

Going ahead to step 1:
The number 86 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (5) from the dividend, add it to 3, then carry on: 35 / 86

Moving on to step 2:
86 can be fit into 35 0 times, resulting in a remainder of 35.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Bring next digit (1) of the dividend behind the 35 and repeat the process: 351 / 86

Let's proceed to step 3:
When dividing 351 by 86, we get 4 with a remainder of 7.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 344 from 351 leaves us with 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 86

On to step 4:
The number 86 fits into 72 0 times, leaving a remainder of 72.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
If we take 0 away from 72, we end up with 72.
Bring next digit (1) of the dividend behind the 72 and repeat the process: 721 / 86

Step 5:
86 can be fit into 721 8 times, resulting in a remainder of 33.
Use 8 as the next digit of our solution. 
Result so far: 408.0
The remainder is 33 after subtracting 688 from 721.
Include the next digit (3) from the dividend after 33, then repeat: 333 / 86

On to step 6:
86 goes into 333 3 times with a remainder of 75.
Record the quotient 3 as the next digit in the result. 
Result so far: 4083.0
The remainder is 75 after subtracting 258 from 333.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 7:
750 divided by 86 is 8 with a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 4083.8
The remainder is 62 after subtracting 688 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 8:
If we divide 620 by 86, we get 7 and a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 4083.87
Subtract 602 from 620 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
86 goes into 180 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 4083.872
If we subtract 172 from 180, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
If we divide 80 by 86, we get 0 and a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 4083.872
If we subtract 0 from 80, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 11:
When dividing 800 by 86, we get 9 with a remainder of 26.
Put 9 as the next digit of the answer. 
Result so far: 4083.87209
Subtract 774 from 800 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 12:
86 can be fit into 260 3 times, resulting in a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 4083.872093
The remainder is 2 after subtracting 258 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 13:
The number 86 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 4083.872093
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
The number 86 fits into 200 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 4083.87209302
If we subtract 172 from 200, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

In conclusion, the division gives 4083.87209302 with a balance of 2.8e-08.