We look at the division of 873458 by 86 
We're looking to find how many times 86 goes into 873458.

Step 1:
If we divide 8 by 86, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 86

Going ahead to step 2:
The number 86 fits into 87 1 times, leaving a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 86 from 87 and we're left with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 86

Let's proceed to step 3:
The number 86 fits into 13 0 times, leaving a remainder of 13.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 13 and we're left with 13.
Include the next digit (4) from the dividend after 13, then repeat: 134 / 86

Let's proceed to step 4:
86 can be fit into 134 1 times, resulting in a remainder of 48.
The next digit of our result is 1. 
Result so far: 101.0
If we take 86 away from 134, we end up with 48.
Bring next digit (5) of the dividend behind the 48 and repeat the process: 485 / 86

On to step 5:
When dividing 485 by 86, we get 5 with a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 1015.0
If we subtract 430 from 485, we get 55.
Bring next digit (8) of the dividend behind the 55 and repeat the process: 558 / 86

Let's proceed to step 6:
86 can be fit into 558 6 times, resulting in a remainder of 42.
Use 6 as the next digit of our solution. 
Result so far: 10156.0
If we take 516 away from 558, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 7:
86 goes into 420 4 times with a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 10156.4
If we take 344 away from 420, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Going ahead to step 8:
760 divided by 86 is 8 with a remainder of 72.
Put 8 as the next digit of the answer. 
Result so far: 10156.48
Subtract 688 from 760 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 9:
720 divided by 86 is 8 with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 10156.488
The remainder is 32 after subtracting 688 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The final result is 10156.488 with a remainder of 0.0032.