Finding the Fourth Proportional to 142.38, 196.50 and 103.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142.38 : 196.50 = 103.10 : x
2. Step 2: Convert to fraction form
   142.38/196.50 = 103.10/x
3. Step 3: Cross multiply
   142.38x = 196.50 × 103.10
4. Step 4: Simplify right side
   142.38x = 20,258.17
5. Step 5: Solve for x
   x = 20,258.17/142.38
6. Step 6: Final answer
   x = 142.28