Finding the Fourth Proportional to 257,488.86, 355,320.41 and 142,760.82

Step by Step Solution

1. Step 1: Write the proportion equation
   257,488.86 : 355,320.41 = 142,760.82 : x
2. Step 2: Convert to fraction form
   257,488.86/355,320.41 = 142,760.82/x
3. Step 3: Cross multiply
   257,488.86x = 355,320.41 × 142,760.82
4. Step 4: Simplify right side
   257,488.86x = 50,725,833,094.34
5. Step 5: Solve for x
   x = 50,725,833,094.34/257,488.86
6. Step 6: Final answer
   x = 197,002.05