Finding the Fourth Proportional to 518,933.86, 716,128.41 and 280,469.86

Step by Step Solution

1. Step 1: Write the proportion equation
   518,933.86 : 716,128.41 = 280,469.86 : x
2. Step 2: Convert to fraction form
   518,933.86/716,128.41 = 280,469.86/x
3. Step 3: Cross multiply
   518,933.86x = 716,128.41 × 280,469.86
4. Step 4: Simplify right side
   518,933.86x = 200,852,434,894.72
5. Step 5: Solve for x
   x = 200,852,434,894.72/518,933.86
6. Step 6: Final answer
   x = 387,048.24