Finding the Fourth Proportional to 256,934.69, 354,560.82 and 142,213.55

Step by Step Solution

1. Step 1: Write the proportion equation
   256,934.69 : 354,560.82 = 142,213.55 : x
2. Step 2: Convert to fraction form
   256,934.69/354,560.82 = 142,213.55/x
3. Step 3: Cross multiply
   256,934.69x = 354,560.82 × 142,213.55
4. Step 4: Simplify right side
   256,934.69x = 50,423,353,256.21
5. Step 5: Solve for x
   x = 50,423,353,256.21/256,934.69
6. Step 6: Final answer
   x = 196,249.69