Finding the Fourth Proportional to 142.32, 196.37 and 86.28

Step by Step Solution

1. Step 1: Write the proportion equation
   142.32 : 196.37 = 86.28 : x
2. Step 2: Convert to fraction form
   142.32/196.37 = 86.28/x
3. Step 3: Cross multiply
   142.32x = 196.37 × 86.28
4. Step 4: Simplify right side
   142.32x = 16,942.37
5. Step 5: Solve for x
   x = 16,942.37/142.32
6. Step 6: Final answer
   x = 119.04