Finding the Fourth Proportional to 257,155.75, 354,876.15 and 143,978.50

Step by Step Solution

1. Step 1: Write the proportion equation
   257,155.75 : 354,876.15 = 143,978.50 : x
2. Step 2: Convert to fraction form
   257,155.75/354,876.15 = 143,978.50/x
3. Step 3: Cross multiply
   257,155.75x = 354,876.15 × 143,978.50
4. Step 4: Simplify right side
   257,155.75x = 51,094,535,762.78
5. Step 5: Solve for x
   x = 51,094,535,762.78/257,155.75
6. Step 6: Final answer
   x = 198,691.01