Step 1:
The first step to converting 287138.78187511 to a fraction is to re-write 287138.78187511 in the form p/q where p and q are both positive integers. To start with, 287138.78187511 can be written as simply 287138.78187511/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 287138.78187511, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 287138.78187511/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 287138.78187511/1 each by 100000000:
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 287138.78187511 as a fraction:
287139/1 / 1