Finding the Fourth Proportional to 636,401.78, 878,234.27 and 349,940.42

Step by Step Solution

1. Step 1: Write the proportion equation
   636,401.78 : 878,234.27 = 349,940.42 : x
2. Step 2: Convert to fraction form
   636,401.78/878,234.27 = 349,940.42/x
3. Step 3: Cross multiply
   636,401.78x = 878,234.27 × 349,940.42
4. Step 4: Simplify right side
   636,401.78x = 307,329,663,161.32
5. Step 5: Solve for x
   x = 307,329,663,161.32/636,401.78
6. Step 6: Final answer
   x = 482,917.67