Step 1:
The first step to converting 399667.15645 to a fraction is to re-write 399667.15645 in the form p/q where p and q are both positive integers. To start with, 399667.15645 can be written as simply 399667.15645/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 399667.15645, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 399667.15645/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 399667.15645/1 each by 100000:
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 399667.15645 as a fraction:
399667/1 / 1