Finding the Fourth Proportional to 388,796.49, 581,877.54 and 239,131.71

Step by Step Solution

1. Step 1: Write the proportion equation
   388,796.49 : 581,877.54 = 239,131.71 : x
2. Step 2: Convert to fraction form
   388,796.49/581,877.54 = 239,131.71/x
3. Step 3: Cross multiply
   388,796.49x = 581,877.54 × 239,131.71
4. Step 4: Simplify right side
   388,796.49x = 139,145,371,150.79
5. Step 5: Solve for x
   x = 139,145,371,150.79/388,796.49
6. Step 6: Final answer
   x = 357,887.42