Finding the Fourth Proportional to 288,061.20, 397,711.71 and 257,794.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,061.20 : 397,711.71 = 257,794.50 : x
2. Step 2: Convert to fraction form
   288,061.20/397,711.71 = 257,794.50/x
3. Step 3: Cross multiply
   288,061.20x = 397,711.71 × 257,794.50
4. Step 4: Simplify right side
   288,061.20x = 102,527,891,423.60
5. Step 5: Solve for x
   x = 102,527,891,423.60/288,061.20
6. Step 6: Final answer
   x = 355,923.99