Finding the Fourth Proportional to 256,857.61, 354,454.33 and 142,134.27

Step by Step Solution

1. Step 1: Write the proportion equation
   256,857.61 : 354,454.33 = 142,134.27 : x
2. Step 2: Convert to fraction form
   256,857.61/354,454.33 = 142,134.27/x
3. Step 3: Cross multiply
   256,857.61x = 354,454.33 × 142,134.27
4. Step 4: Simplify right side
   256,857.61x = 50,380,107,442.89
5. Step 5: Solve for x
   x = 50,380,107,442.89/256,857.61
6. Step 6: Final answer
   x = 196,140.22