Step 1:
The first step to converting 12187.905446524 to a fraction is to re-write 12187.905446524 in the form p/q where p and q are both positive integers. To start with, 12187.905446524 can be written as simply 12187.905446524/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 12187.905446524, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 12187.905446524/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 12187.905446524/1 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 12187.905446524 as a fraction:
121879/10 / 1