Finding the Fourth Proportional to 142.68, 196.38 and 131.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142.68 : 196.38 = 131.88 : x
2. Step 2: Convert to fraction form
   142.68/196.38 = 131.88/x
3. Step 3: Cross multiply
   142.68x = 196.38 × 131.88
4. Step 4: Simplify right side
   142.68x = 25,898.59
5. Step 5: Solve for x
   x = 25,898.59/142.68
6. Step 6: Final answer
   x = 181.52