Finding the Fourth Proportional to 339,055.29, 508,693.91 and 139,469.67

Step by Step Solution

1. Step 1: Write the proportion equation
   339,055.29 : 508,693.91 = 139,469.67 : x
2. Step 2: Convert to fraction form
   339,055.29/508,693.91 = 139,469.67/x
3. Step 3: Cross multiply
   339,055.29x = 508,693.91 × 139,469.67
4. Step 4: Simplify right side
   339,055.29x = 70,947,371,061.36
5. Step 5: Solve for x
   x = 70,947,371,061.36/339,055.29
6. Step 6: Final answer
   x = 209,250.15