Finding the Fourth Proportional to 257,196.20, 354,922.72 and 142,470.24

Step by Step Solution

1. Step 1: Write the proportion equation
   257,196.20 : 354,922.72 = 142,470.24 : x
2. Step 2: Convert to fraction form
   257,196.20/354,922.72 = 142,470.24/x
3. Step 3: Cross multiply
   257,196.20x = 354,922.72 × 142,470.24
4. Step 4: Simplify right side
   257,196.20x = 50,565,925,099.85
5. Step 5: Solve for x
   x = 50,565,925,099.85/257,196.20
6. Step 6: Final answer
   x = 196,604.48