Step 1:
The first step to converting 18917.488451785 to a fraction is to re-write 18917.488451785 in the form p/q where p and q are both positive integers. To start with, 18917.488451785 can be written as simply 18917.488451785/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 18917.488451785, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 18917.488451785/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 18917.488451785/1 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 18917.488451785 as a fraction:
37835/2 / 1