Finding the Fourth Proportional to 429,141.30, 644,003.55 and 239,601.30

Step by Step Solution

1. Step 1: Write the proportion equation
   429,141.30 : 644,003.55 = 239,601.30 : x
2. Step 2: Convert to fraction form
   429,141.30/644,003.55 = 239,601.30/x
3. Step 3: Cross multiply
   429,141.30x = 644,003.55 × 239,601.30
4. Step 4: Simplify right side
   429,141.30x = 154,304,087,784.62
5. Step 5: Solve for x
   x = 154,304,087,784.62/429,141.30
6. Step 6: Final answer
   x = 359,564.76