Finding the Fourth Proportional to 142.17, 196.15 and 83.16

Step by Step Solution

1. Step 1: Write the proportion equation
   142.17 : 196.15 = 83.16 : x
2. Step 2: Convert to fraction form
   142.17/196.15 = 83.16/x
3. Step 3: Cross multiply
   142.17x = 196.15 × 83.16
4. Step 4: Simplify right side
   142.17x = 16,311.83
5. Step 5: Solve for x
   x = 16,311.83/142.17
6. Step 6: Final answer
   x = 114.73