We look at the division of 3984591 by 911 
The aim is to understand the frequency of 911 in 3984591.

Advancing to step 1:
The number 911 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 911

Let's proceed to step 2:
The number 911 fits into 39 0 times, leaving a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 39 and we're left with 39.
Bring next digit (8) of the dividend behind the 39 and repeat the process: 398 / 911

Moving on to step 3:
911 can be fit into 398 0 times, resulting in a remainder of 398.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 398 after subtracting 0 from 398.
Take the next digit (4) from the dividend and append it to 398, then repeat: 3984 / 911

Going ahead to step 4:
When dividing 3984 by 911, we get 4 with a remainder of 340.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 3644 from 3984 to get 340.
Fetch the next digit (5) from the dividend, attach it to 340 and continue: 3405 / 911

Moving on to step 5:
If we divide 3405 by 911, we get 3 and a remainder of 672.
Put 3 as the next digit of the answer. 
Result so far: 43.0
Subtracting 2733 from 3405 leaves us with 672.
Bring next digit (9) of the dividend behind the 672 and repeat the process: 6729 / 911

Let's proceed to step 6:
911 goes into 6729 7 times with a remainder of 352.
The number 7 becomes the next digit in our result. 
Result so far: 437.0
If we take 6377 away from 6729, we end up with 352.
Append the next digit (1) from the dividend to 352 and continue with: 3521 / 911

Moving on to step 7:
911 goes into 3521 3 times with a remainder of 788.
Use 3 as the next digit of our solution. 
Result so far: 4373.0
Subtract 2733 from 3521 to get 788.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7880, and continue the process.

Going ahead to step 8:
7880 divided by 911 is 8 with a remainder of 592.
Write down 8 as next digit of the result. 
Result so far: 4373.8
The remainder is 592 after subtracting 7288 from 7880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5920, and continue the process.

Step 9:
911 can be fit into 5920 6 times, resulting in a remainder of 454.
Put 6 as the next digit of the answer. 
Result so far: 4373.86
If we subtract 5466 from 5920, we get 454.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4540, and continue the process.

Going ahead to step 10:
911 goes into 4540 4 times with a remainder of 896.
Use 4 as the next digit of our solution. 
Result so far: 4373.864
Subtracting 3644 from 4540 leaves us with 896.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8960, and continue the process.

Let's proceed to step 11:
911 can be fit into 8960 9 times, resulting in a remainder of 761.
Use 9 as the next digit of our solution. 
Result so far: 4373.8649
Deduct 8199 from 8960 and we're left with 761.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7610, and continue the process.

Step 12:
If we divide 7610 by 911, we get 8 and a remainder of 322.
Use 8 as the next digit of our solution. 
Result so far: 4373.86498
Deduct 7288 from 7610 and we're left with 322.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3220, and continue the process.

On to step 13:
911 can be fit into 3220 3 times, resulting in a remainder of 487.
Put 3 as the next digit of the answer. 
Result so far: 4373.864983
Deduct 2733 from 3220 and we're left with 487.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4870, and continue the process.

Let's proceed to step 14:
911 can be fit into 4870 5 times, resulting in a remainder of 315.
Record the quotient 5 as the next digit in the result. 
Result so far: 4373.8649835
Subtract 4555 from 4870 to get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

Moving on to step 15:
911 goes into 3150 3 times with a remainder of 417.
Put 3 as the next digit of the answer. 
Result so far: 4373.86498353
Deduct 2733 from 3150 and we're left with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

After the division, we end up with 4373.86498353 and a remainder of 4.17e-07.