Finding the Fourth Proportional to 390,662.52, 582,709.56 and 354,784.80

Step by Step Solution

1. Step 1: Write the proportion equation
   390,662.52 : 582,709.56 = 354,784.80 : x
2. Step 2: Convert to fraction form
   390,662.52/582,709.56 = 354,784.80/x
3. Step 3: Cross multiply
   390,662.52x = 582,709.56 × 354,784.80
4. Step 4: Simplify right side
   390,662.52x = 206,736,494,702.69
5. Step 5: Solve for x
   x = 206,736,494,702.69/390,662.52
6. Step 6: Final answer
   x = 529,194.60