Finding the Fourth Proportional to 498,500.72, 687,907 and 283,620.72

Step by Step Solution

1. Step 1: Write the proportion equation
   498,500.72 : 687,907 = 283,620.72 : x
2. Step 2: Convert to fraction form
   498,500.72/687,907 = 283,620.72/x
3. Step 3: Cross multiply
   498,500.72x = 687,907 × 283,620.72
4. Step 4: Simplify right side
   498,500.72x = 195,104,678,633.04
5. Step 5: Solve for x
   x = 195,104,678,633.04/498,500.72
6. Step 6: Final answer
   x = 391,382.94