Finding the Fourth Proportional to 142.96, 196.72 and 105.97

Step by Step Solution

1. Step 1: Write the proportion equation
   142.96 : 196.72 = 105.97 : x
2. Step 2: Convert to fraction form
   142.96/196.72 = 105.97/x
3. Step 3: Cross multiply
   142.96x = 196.72 × 105.97
4. Step 4: Simplify right side
   142.96x = 20,846.42
5. Step 5: Solve for x
   x = 20,846.42/142.96
6. Step 6: Final answer
   x = 145.82