Finding the Fourth Proportional to 518,970.72, 716,177.52 and 280,506.72

Step by Step Solution

1. Step 1: Write the proportion equation
   518,970.72 : 716,177.52 = 280,506.72 : x
2. Step 2: Convert to fraction form
   518,970.72/716,177.52 = 280,506.72/x
3. Step 3: Cross multiply
   518,970.72x = 716,177.52 × 280,506.72
4. Step 4: Simplify right side
   518,970.72x = 200,892,607,072.93
5. Step 5: Solve for x
   x = 200,892,607,072.93/518,970.72
6. Step 6: Final answer
   x = 387,098.15