Finding the Fourth Proportional to 404,329.30, 605,327.55 and 392,665.30

Step by Step Solution

1. Step 1: Write the proportion equation
   404,329.30 : 605,327.55 = 392,665.30 : x
2. Step 2: Convert to fraction form
   404,329.30/605,327.55 = 392,665.30/x
3. Step 3: Cross multiply
   404,329.30x = 605,327.55 × 392,665.30
4. Step 4: Simplify right side
   404,329.30x = 237,691,124,019.02
5. Step 5: Solve for x
   x = 237,691,124,019.02/404,329.30
6. Step 6: Final answer
   x = 587,865.20