Step 1:
The first step to converting 21475.308636521 to a fraction is to re-write 21475.308636521 in the form p/q where p and q are both positive integers. To start with, 21475.308636521 can be written as simply 21475.308636521/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 21475.308636521, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 21475.308636521/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 21475.308636521/1 each by 1000000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 21475.308636521 as a fraction:
279179/13 / 1