Finding the Fourth Proportional to 243,777.60, 335,456.64 and 215,550.72

Step by Step Solution

1. Step 1: Write the proportion equation
   243,777.60 : 335,456.64 = 215,550.72 : x
2. Step 2: Convert to fraction form
   243,777.60/335,456.64 = 215,550.72/x
3. Step 3: Cross multiply
   243,777.60x = 335,456.64 × 215,550.72
4. Step 4: Simplify right side
   243,777.60x = 72,307,920,280.78
5. Step 5: Solve for x
   x = 72,307,920,280.78/243,777.60
6. Step 6: Final answer
   x = 296,614.29