Finding the Fourth Proportional to 142.29, 196.31 and 86.29

Step by Step Solution

1. Step 1: Write the proportion equation
   142.29 : 196.31 = 86.29 : x
2. Step 2: Convert to fraction form
   142.29/196.31 = 86.29/x
3. Step 3: Cross multiply
   142.29x = 196.31 × 86.29
4. Step 4: Simplify right side
   142.29x = 16,939.31
5. Step 5: Solve for x
   x = 16,939.31/142.29
6. Step 6: Final answer
   x = 119.05