Finding the Fourth Proportional to 487,443.60, 730,128.60 and 404,499.60

Step by Step Solution

1. Step 1: Write the proportion equation
   487,443.60 : 730,128.60 = 404,499.60 : x
2. Step 2: Convert to fraction form
   487,443.60/730,128.60 = 404,499.60/x
3. Step 3: Cross multiply
   487,443.60x = 730,128.60 × 404,499.60
4. Step 4: Simplify right side
   487,443.60x = 295,336,726,648.56
5. Step 5: Solve for x
   x = 295,336,726,648.56/487,443.60
6. Step 6: Final answer
   x = 605,889.02