Step 1:
The first step to converting 3685.8531678126 to a fraction is to re-write 3685.8531678126 in the form p/q where p and q are both positive integers. To start with, 3685.8531678126 can be written as simply 3685.8531678126/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 3685.8531678126, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 3685.8531678126/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 3685.8531678126/1 each by 10000000000:
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 3685.8531678126 as a fraction:
125319/34 / 1