Finding the Fourth Proportional to 142.24, 196.18 and 93.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142.24 : 196.18 = 93.15 : x
2. Step 2: Convert to fraction form
   142.24/196.18 = 93.15/x
3. Step 3: Cross multiply
   142.24x = 196.18 × 93.15
4. Step 4: Simplify right side
   142.24x = 18,274.17
5. Step 5: Solve for x
   x = 18,274.17/142.24
6. Step 6: Final answer
   x = 128.47