Finding the Fourth Proportional to 498,443.37, 687,843 and 283,578.81

Step by Step Solution

1. Step 1: Write the proportion equation
   498,443.37 : 687,843 = 283,578.81 : x
2. Step 2: Convert to fraction form
   498,443.37/687,843 = 283,578.81/x
3. Step 3: Cross multiply
   498,443.37x = 687,843 × 283,578.81
4. Step 4: Simplify right side
   498,443.37x = 195,057,699,406.83
5. Step 5: Solve for x
   x = 195,057,699,406.83/498,443.37
6. Step 6: Final answer
   x = 391,333.72