Finding the Fourth Proportional to 629,455.86, 868,638.15 and 342,978.30

Step by Step Solution

1. Step 1: Write the proportion equation
   629,455.86 : 868,638.15 = 342,978.30 : x
2. Step 2: Convert to fraction form
   629,455.86/868,638.15 = 342,978.30/x
3. Step 3: Cross multiply
   629,455.86x = 868,638.15 × 342,978.30
4. Step 4: Simplify right side
   629,455.86x = 297,924,036,002.15
5. Step 5: Solve for x
   x = 297,924,036,002.15/629,455.86
6. Step 6: Final answer
   x = 473,304.09