Finding the Fourth Proportional to 142.81, 196.88 and 103.52

Step by Step Solution

1. Step 1: Write the proportion equation
   142.81 : 196.88 = 103.52 : x
2. Step 2: Convert to fraction form
   142.81/196.88 = 103.52/x
3. Step 3: Cross multiply
   142.81x = 196.88 × 103.52
4. Step 4: Simplify right side
   142.81x = 20,381.02
5. Step 5: Solve for x
   x = 20,381.02/142.81
6. Step 6: Final answer
   x = 142.72