Step 1:
The first step to converting 40187.8008409 to a fraction is to re-write 40187.8008409 in the form p/q where p and q are both positive integers. To start with, 40187.8008409 can be written as simply 40187.8008409/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 40187.8008409, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 40187.8008409/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 40187.8008409/1 each by 10000000:
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 40187.8008409 as a fraction:
200939/5 / 1