Finding the Fourth Proportional to 257,196.96, 354,923.78 and 142,470.99

Step by Step Solution

1. Step 1: Write the proportion equation
   257,196.96 : 354,923.78 = 142,470.99 : x
2. Step 2: Convert to fraction form
   257,196.96/354,923.78 = 142,470.99/x
3. Step 3: Cross multiply
   257,196.96x = 354,923.78 × 142,470.99
4. Step 4: Simplify right side
   257,196.96x = 50,566,341,598.79
5. Step 5: Solve for x
   x = 50,566,341,598.79/257,196.96
6. Step 6: Final answer
   x = 196,605.52