Finding the Fourth Proportional to 439,978.50, 607,177.62 and 238,774.50

Step by Step Solution

1. Step 1: Write the proportion equation
   439,978.50 : 607,177.62 = 238,774.50 : x
2. Step 2: Convert to fraction form
   439,978.50/607,177.62 = 238,774.50/x
3. Step 3: Cross multiply
   439,978.50x = 607,177.62 × 238,774.50
4. Step 4: Simplify right side
   439,978.50x = 144,978,532,626.69
5. Step 5: Solve for x
   x = 144,978,532,626.69/439,978.50
6. Step 6: Final answer
   x = 329,512.77