Finding the Fourth Proportional to 518,404.42, 715,401.33 and 288,976.27

Step by Step Solution

1. Step 1: Write the proportion equation
   518,404.42 : 715,401.33 = 288,976.27 : x
2. Step 2: Convert to fraction form
   518,404.42/715,401.33 = 288,976.27/x
3. Step 3: Cross multiply
   518,404.42x = 715,401.33 × 288,976.27
4. Step 4: Simplify right side
   518,404.42x = 206,734,007,896.44
5. Step 5: Solve for x
   x = 206,734,007,896.44/518,404.42
6. Step 6: Final answer
   x = 398,789.05