Finding the Fourth Proportional to 395,238.69, 592,952.50 and 128,999.69

Step by Step Solution

1. Step 1: Write the proportion equation
   395,238.69 : 592,952.50 = 128,999.69 : x
2. Step 2: Convert to fraction form
   395,238.69/592,952.50 = 128,999.69/x
3. Step 3: Cross multiply
   395,238.69x = 592,952.50 × 128,999.69
4. Step 4: Simplify right side
   395,238.69x = 76,490,688,104.78
5. Step 5: Solve for x
   x = 76,490,688,104.78/395,238.69
6. Step 6: Final answer
   x = 193,530.37