Finding the Fourth Proportional to 339,060.30, 508,755.69 and 139,440.54

Step by Step Solution

1. Step 1: Write the proportion equation
   339,060.30 : 508,755.69 = 139,440.54 : x
2. Step 2: Convert to fraction form
   339,060.30/508,755.69 = 139,440.54/x
3. Step 3: Cross multiply
   339,060.30x = 508,755.69 × 139,440.54
4. Step 4: Simplify right side
   339,060.30x = 70,941,168,141.67
5. Step 5: Solve for x
   x = 70,941,168,141.67/339,060.30
6. Step 6: Final answer
   x = 209,228.77