Finding the Fourth Proportional to 498,438.72, 687,834.72 and 272,088

Step by Step Solution

1. Step 1: Write the proportion equation
   498,438.72 : 687,834.72 = 272,088 : x
2. Step 2: Convert to fraction form
   498,438.72/687,834.72 = 272,088/x
3. Step 3: Cross multiply
   498,438.72x = 687,834.72 × 272,088
4. Step 4: Simplify right side
   498,438.72x = 187,151,573,295.36
5. Step 5: Solve for x
   x = 187,151,573,295.36/498,438.72
6. Step 6: Final answer
   x = 375,475.59