Finding the Fourth Proportional to 409,359.50, 614,061.12 and 128,898.62

Step by Step Solution

1. Step 1: Write the proportion equation
   409,359.50 : 614,061.12 = 128,898.62 : x
2. Step 2: Convert to fraction form
   409,359.50/614,061.12 = 128,898.62/x
3. Step 3: Cross multiply
   409,359.50x = 614,061.12 × 128,898.62
4. Step 4: Simplify right side
   409,359.50x = 79,151,630,963.65
5. Step 5: Solve for x
   x = 79,151,630,963.65/409,359.50
6. Step 6: Final answer
   x = 193,354.82