Finding the Fourth Proportional to 339,150.72, 509,002.56 and 172,986.24

Step by Step Solution

1. Step 1: Write the proportion equation
   339,150.72 : 509,002.56 = 172,986.24 : x
2. Step 2: Convert to fraction form
   339,150.72/509,002.56 = 172,986.24/x
3. Step 3: Cross multiply
   339,150.72x = 509,002.56 × 172,986.24
4. Step 4: Simplify right side
   339,150.72x = 88,050,439,004.77
5. Step 5: Solve for x
   x = 88,050,439,004.77/339,150.72
6. Step 6: Final answer
   x = 259,620.38