We look at the division of 603771 by 58 
The aim is to understand the frequency of 58 in 603771.

Advancing to step 1:
The number 58 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 58

Advancing to step 2:
When dividing 60 by 58, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 58 away from 60, we end up with 2.
Bring next digit (3) of the dividend behind the 2 and repeat the process: 23 / 58

Let's proceed to step 3:
If we divide 23 by 58, we get 0 and a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 23 leaves us with 23.
Fetch the next digit (7) from the dividend, attach it to 23 and continue: 237 / 58

Going ahead to step 4:
58 goes into 237 4 times with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 104.0
Subtracting 232 from 237 leaves us with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 58

Advancing to step 5:
58 can be fit into 57 0 times, resulting in a remainder of 57.
The next digit of our result is 0. 
Result so far: 1040.0
Subtracting 0 from 57 leaves us with 57.
Take the next digit (1) from the dividend and append it to 57, then repeat: 571 / 58

Let's proceed to step 6:
58 goes into 571 9 times with a remainder of 49.
Use 9 as the next digit of our solution. 
Result so far: 10409.0
If we take 522 away from 571, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 7:
58 goes into 490 8 times with a remainder of 26.
The number 8 becomes the next digit in our result. 
Result so far: 10409.8
Subtracting 464 from 490 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 8:
When dividing 260 by 58, we get 4 with a remainder of 28.
Record the quotient 4 as the next digit in the result. 
Result so far: 10409.84
Deduct 232 from 260 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.

Moving on to step 9:
If we divide 280 by 58, we get 4 and a remainder of 48.
Write down 4 as next digit of the result. 
Result so far: 10409.844
If we subtract 232 from 280, we get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final outcome is 10409.844, with a leftover of 0.0048.