Finding the Fourth Proportional to 257,814.27, 355,786.43 and 143,095.05

Step by Step Solution

1. Step 1: Write the proportion equation
   257,814.27 : 355,786.43 = 143,095.05 : x
2. Step 2: Convert to fraction form
   257,814.27/355,786.43 = 143,095.05/x
3. Step 3: Cross multiply
   257,814.27x = 355,786.43 × 143,095.05
4. Step 4: Simplify right side
   257,814.27x = 50,911,276,274.70
5. Step 5: Solve for x
   x = 50,911,276,274.70/257,814.27
6. Step 6: Final answer
   x = 197,472.69