Finding the Fourth Proportional to 384,787.98, 531,006.56 and 215,022.12

Step by Step Solution

1. Step 1: Write the proportion equation
   384,787.98 : 531,006.56 = 215,022.12 : x
2. Step 2: Convert to fraction form
   384,787.98/531,006.56 = 215,022.12/x
3. Step 3: Cross multiply
   384,787.98x = 531,006.56 × 215,022.12
4. Step 4: Simplify right side
   384,787.98x = 114,178,156,265.11
5. Step 5: Solve for x
   x = 114,178,156,265.11/384,787.98
6. Step 6: Final answer
   x = 296,730.05