Finding the Fourth Proportional to 518,643, 715,727.34 and 280,179

Step by Step Solution

1. Step 1: Write the proportion equation
   518,643 : 715,727.34 = 280,179 : x
2. Step 2: Convert to fraction form
   518,643/715,727.34 = 280,179/x
3. Step 3: Cross multiply
   518,643x = 715,727.34 × 280,179
4. Step 4: Simplify right side
   518,643x = 200,531,770,393.86
5. Step 5: Solve for x
   x = 200,531,770,393.86/518,643
6. Step 6: Final answer
   x = 386,647.02