Finding the Fourth Proportional to 257,870.71, 355,855.98 and 143,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   257,870.71 : 355,855.98 = 143,142.72 : x
2. Step 2: Convert to fraction form
   257,870.71/355,855.98 = 143,142.72/x
3. Step 3: Cross multiply
   257,870.71x = 355,855.98 × 143,142.72
4. Step 4: Simplify right side
   257,870.71x = 50,938,192,905.47
5. Step 5: Solve for x
   x = 50,938,192,905.47/257,870.71
6. Step 6: Final answer
   x = 197,533.85