Finding the Fourth Proportional to 339,662.55, 509,632.17 and 171,231.42

Step by Step Solution

1. Step 1: Write the proportion equation
   339,662.55 : 509,632.17 = 171,231.42 : x
2. Step 2: Convert to fraction form
   339,662.55/509,632.17 = 171,231.42/x
3. Step 3: Cross multiply
   339,662.55x = 509,632.17 × 171,231.42
4. Step 4: Simplify right side
   339,662.55x = 87,265,040,146.78
5. Step 5: Solve for x
   x = 87,265,040,146.78/339,662.55
6. Step 6: Final answer
   x = 256,916.87