Finding the Fourth Proportional to 394,942.52, 592,300.62 and 128,726.30

Step by Step Solution

1. Step 1: Write the proportion equation
   394,942.52 : 592,300.62 = 128,726.30 : x
2. Step 2: Convert to fraction form
   394,942.52/592,300.62 = 128,726.30/x
3. Step 3: Cross multiply
   394,942.52x = 592,300.62 × 128,726.30
4. Step 4: Simplify right side
   394,942.52x = 76,244,667,300.31
5. Step 5: Solve for x
   x = 76,244,667,300.31/394,942.52
6. Step 6: Final answer
   x = 193,052.57