Finding the Fourth Proportional to 216.47, 298.49 and 142.69

Step by Step Solution

1. Step 1: Write the proportion equation
   216.47 : 298.49 = 142.69 : x
2. Step 2: Convert to fraction form
   216.47/298.49 = 142.69/x
3. Step 3: Cross multiply
   216.47x = 298.49 × 142.69
4. Step 4: Simplify right side
   216.47x = 42,591.42
5. Step 5: Solve for x
   x = 42,591.42/216.47
6. Step 6: Final answer
   x = 196.76