Finding the Fourth Proportional to 257,510.59, 355,365.38 and 142,797.31

Step by Step Solution

1. Step 1: Write the proportion equation
   257,510.59 : 355,365.38 = 142,797.31 : x
2. Step 2: Convert to fraction form
   257,510.59/355,365.38 = 142,797.31/x
3. Step 3: Cross multiply
   257,510.59x = 355,365.38 × 142,797.31
4. Step 4: Simplify right side
   257,510.59x = 50,745,219,799.71
5. Step 5: Solve for x
   x = 50,745,219,799.71/257,510.59
6. Step 6: Final answer
   x = 197,060.71