We're dividing 10850371 by 858 
Let's see how many times 858 fits into 10850371.

Going ahead to step 1:
The number 858 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 858

Going ahead to step 2:
When dividing 10 by 858, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 10 leaves us with 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 858

Advancing to step 3:
If we divide 108 by 858, we get 0 and a remainder of 108.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 108, we end up with 108.
Append the next digit (5) from the dividend to 108 and continue with: 1085 / 858

On to step 4:
When dividing 1085 by 858, we get 1 with a remainder of 227.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 858 from 1085, we get 227.
Include the next digit (0) from the dividend after 227, then repeat: 2270 / 858

On to step 5:
When dividing 2270 by 858, we get 2 with a remainder of 554.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 1716 from 2270, we get 554.
Take the next digit (3) from the dividend and append it to 554, then repeat: 5543 / 858

Let's proceed to step 6:
858 goes into 5543 6 times with a remainder of 395.
The next digit of our result is 6. 
Result so far: 126.0
Subtracting 5148 from 5543 leaves us with 395.
Bring next digit (7) of the dividend behind the 395 and repeat the process: 3957 / 858

Step 7:
858 goes into 3957 4 times with a remainder of 525.
Put 4 as the next digit of the answer. 
Result so far: 1264.0
Subtract 3432 from 3957 to get 525.
Bring next digit (1) of the dividend behind the 525 and repeat the process: 5251 / 858

Let's proceed to step 8:
5251 divided by 858 is 6 with a remainder of 103.
Use 6 as the next digit of our solution. 
Result so far: 12646.0
Deduct 5148 from 5251 and we're left with 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Let's proceed to step 9:
If we divide 1030 by 858, we get 1 and a remainder of 172.
Record the quotient 1 as the next digit in the result. 
Result so far: 12646.1
Deduct 858 from 1030 and we're left with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

Advancing to step 10:
When dividing 1720 by 858, we get 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 12646.12
Deduct 1716 from 1720 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 11:
If we divide 40 by 858, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 12646.12
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
The number 858 fits into 400 0 times, leaving a remainder of 400.
Write down 0 as next digit of the result. 
Result so far: 12646.12
Subtract 0 from 400 to get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

The final result is 12646.12 with a remainder of 0.004.