Step 1:
The first step to converting 18518.578655004 to a fraction is to re-write 18518.578655004 in the form p/q where p and q are both positive integers. To start with, 18518.578655004 can be written as simply 18518.578655004/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 18518.578655004, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 18518.578655004/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 18518.578655004/1 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 18518.578655004 as a fraction:
129630/7 / 1