Finding the Fourth Proportional to 256,039.21, 353,333.89 and 142,861.96

Step by Step Solution

1. Step 1: Write the proportion equation
   256,039.21 : 353,333.89 = 142,861.96 : x
2. Step 2: Convert to fraction form
   256,039.21/353,333.89 = 142,861.96/x
3. Step 3: Cross multiply
   256,039.21x = 353,333.89 × 142,861.96
4. Step 4: Simplify right side
   256,039.21x = 50,477,972,059.82
5. Step 5: Solve for x
   x = 50,477,972,059.82/256,039.21
6. Step 6: Final answer
   x = 197,149.38