We look at the division of 19893123 by 858 
We're looking to find how many times 858 goes into 19893123.

Let's proceed to step 1:
1 divided by 858 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 858

On to step 2:
When dividing 19 by 858, we get 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 19 to get 19.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 858

Let's proceed to step 3:
The number 858 fits into 198 0 times, leaving a remainder of 198.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 198 and we're left with 198.
Include the next digit (9) from the dividend after 198, then repeat: 1989 / 858

Going ahead to step 4:
If we divide 1989 by 858, we get 2 and a remainder of 273.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 273 after subtracting 1716 from 1989.
Take the next digit (3) from the dividend and append it to 273, then repeat: 2733 / 858

Going ahead to step 5:
2733 divided by 858 is 3 with a remainder of 159.
Put 3 as the next digit of the answer. 
Result so far: 23.0
Deduct 2574 from 2733 and we're left with 159.
Append the next digit (1) from the dividend to 159 and continue with: 1591 / 858

Advancing to step 6:
1591 divided by 858 is 1 with a remainder of 733.
Write down 1 as next digit of the result. 
Result so far: 231.0
Subtracting 858 from 1591 leaves us with 733.
Grab the next digit (2) from the dividend, add it to 733, then carry on: 7332 / 858

Step 7:
The number 858 fits into 7332 8 times, leaving a remainder of 468.
Record the quotient 8 as the next digit in the result. 
Result so far: 2318.0
Subtracting 6864 from 7332 leaves us with 468.
Grab the next digit (3) from the dividend, add it to 468, then carry on: 4683 / 858

On to step 8:
4683 divided by 858 is 5 with a remainder of 393.
Record the quotient 5 as the next digit in the result. 
Result so far: 23185.0
If we subtract 4290 from 4683, we get 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Moving on to step 9:
858 goes into 3930 4 times with a remainder of 498.
The number 4 becomes the next digit in our result. 
Result so far: 23185.4
The remainder is 498 after subtracting 3432 from 3930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Step 10:
858 can be fit into 4980 5 times, resulting in a remainder of 690.
The next digit of our result is 5. 
Result so far: 23185.45
Deduct 4290 from 4980 and we're left with 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6900, and continue the process.

Step 11:
858 can be fit into 6900 8 times, resulting in a remainder of 36.
Use 8 as the next digit of our solution. 
Result so far: 23185.458
Deduct 6864 from 6900 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 12:
The number 858 fits into 360 0 times, leaving a remainder of 360.
Use 0 as the next digit of our solution. 
Result so far: 23185.458
The remainder is 360 after subtracting 0 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Advancing to step 13:
The number 858 fits into 3600 4 times, leaving a remainder of 168.
Write down 4 as next digit of the result. 
Result so far: 23185.45804
Subtract 3432 from 3600 to get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

On to step 14:
If we divide 1680 by 858, we get 1 and a remainder of 822.
Put 1 as the next digit of the answer. 
Result so far: 23185.458041
Subtracting 858 from 1680 leaves us with 822.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8220, and continue the process.

Moving on to step 15:
The number 858 fits into 8220 9 times, leaving a remainder of 498.
The number 9 becomes the next digit in our result. 
Result so far: 23185.4580419
If we take 7722 away from 8220, we end up with 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Advancing to step 16:
The number 858 fits into 4980 5 times, leaving a remainder of 690.
The number 5 becomes the next digit in our result. 
Result so far: 23185.45804195
Deduct 4290 from 4980 and we're left with 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6900, and continue the process.

In conclusion, the division gives 23185.45804195 with a balance of 6.9e-07.