Finding the Fourth Proportional to 142.42, 196.55 and 122.82

Step by Step Solution

1. Step 1: Write the proportion equation
   142.42 : 196.55 = 122.82 : x
2. Step 2: Convert to fraction form
   142.42/196.55 = 122.82/x
3. Step 3: Cross multiply
   142.42x = 196.55 × 122.82
4. Step 4: Simplify right side
   142.42x = 24,140.85
5. Step 5: Solve for x
   x = 24,140.85/142.42
6. Step 6: Final answer
   x = 169.51