Finding the Fourth Proportional to 518,509, 715,542.83 and 280,045

Step by Step Solution

1. Step 1: Write the proportion equation
   518,509 : 715,542.83 = 280,045 : x
2. Step 2: Convert to fraction form
   518,509/715,542.83 = 280,045/x
3. Step 3: Cross multiply
   518,509x = 715,542.83 × 280,045
4. Step 4: Simplify right side
   518,509x = 200,384,191,827.35
5. Step 5: Solve for x
   x = 200,384,191,827.35/518,509
6. Step 6: Final answer
   x = 386,462.32