We look at the division of 573139 by 42 
Our goal is to divide 573139 by 42.

On to step 1:
When dividing 5 by 42, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (7) of the dividend behind the 5 and repeat the process: 57 / 42

Let's proceed to step 2:
42 can be fit into 57 1 times, resulting in a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 42 from 57 leaves us with 15.
Bring next digit (3) of the dividend behind the 15 and repeat the process: 153 / 42

On to step 3:
42 can be fit into 153 3 times, resulting in a remainder of 27.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 126 from 153, we get 27.
Bring next digit (1) of the dividend behind the 27 and repeat the process: 271 / 42

On to step 4:
42 goes into 271 6 times with a remainder of 19.
The number 6 becomes the next digit in our result. 
Result so far: 136.0
If we subtract 252 from 271, we get 19.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 42

Step 5:
The number 42 fits into 193 4 times, leaving a remainder of 25.
Use 4 as the next digit of our solution. 
Result so far: 1364.0
The remainder is 25 after subtracting 168 from 193.
Bring next digit (9) of the dividend behind the 25 and repeat the process: 259 / 42

Advancing to step 6:
When dividing 259 by 42, we get 6 with a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 13646.0
Deduct 252 from 259 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 7:
If we divide 70 by 42, we get 1 and a remainder of 28.
Use 1 as the next digit of our solution. 
Result so far: 13646.1
Subtract 42 from 70 to 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.

Moving on to step 8:
42 can be fit into 280 6 times, resulting in a remainder of 28.
The number 6 becomes the next digit in our result. 
Result so far: 13646.16
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 9:
When dividing 280 by 42, we get 6 with a remainder of 28.
Put 6 as the next digit of the answer. 
Result so far: 13646.166
Subtracting 252 from 280 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final outcome is 13646.166, with a leftover of 0.0028.