Step 1:
The first step to converting 4056390.7898958 to a fraction is to re-write 4056390.7898958 in the form p/q where p and q are both positive integers. To start with, 4056390.7898958 can be written as simply 4056390.7898958/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 4056390.7898958, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 4056390.7898958/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 4056390.7898958/1 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 4056390.7898958 as a fraction:
4056390/1 / 1