Finding the Fourth Proportional to 514,434, 709,919.28 and 288,084.72

Step by Step Solution

1. Step 1: Write the proportion equation
   514,434 : 709,919.28 = 288,084.72 : x
2. Step 2: Convert to fraction form
   514,434/709,919.28 = 288,084.72/x
3. Step 3: Cross multiply
   514,434x = 709,919.28 × 288,084.72
4. Step 4: Simplify right side
   514,434x = 204,516,897,001.40
5. Step 5: Solve for x
   x = 204,516,897,001.40/514,434
6. Step 6: Final answer
   x = 397,557.12