Finding the Fourth Proportional to 142.42, 196.07 and 105.52

Step by Step Solution

1. Step 1: Write the proportion equation
   142.42 : 196.07 = 105.52 : x
2. Step 2: Convert to fraction form
   142.42/196.07 = 105.52/x
3. Step 3: Cross multiply
   142.42x = 196.07 × 105.52
4. Step 4: Simplify right side
   142.42x = 20,687.80
5. Step 5: Solve for x
   x = 20,687.80/142.42
6. Step 6: Final answer
   x = 145.26