Finding the Fourth Proportional to 142.59, 196.49 and 103.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142.59 : 196.49 = 103.18 : x
2. Step 2: Convert to fraction form
   142.59/196.49 = 103.18/x
3. Step 3: Cross multiply
   142.59x = 196.49 × 103.18
4. Step 4: Simplify right side
   142.59x = 20,272.86
5. Step 5: Solve for x
   x = 20,272.86/142.59
6. Step 6: Final answer
   x = 142.18