Finding the Fourth Proportional to 498,499.28, 687,925.50 and 272,144.78

Step by Step Solution

1. Step 1: Write the proportion equation
   498,499.28 : 687,925.50 = 272,144.78 : x
2. Step 2: Convert to fraction form
   498,499.28/687,925.50 = 272,144.78/x
3. Step 3: Cross multiply
   498,499.28x = 687,925.50 × 272,144.78
4. Step 4: Simplify right side
   498,499.28x = 187,215,333,853.89
5. Step 5: Solve for x
   x = 187,215,333,853.89/498,499.28
6. Step 6: Final answer
   x = 375,557.88