Finding the Fourth Proportional to 142.16, 196.16 and 83.94

Step by Step Solution

1. Step 1: Write the proportion equation
   142.16 : 196.16 = 83.94 : x
2. Step 2: Convert to fraction form
   142.16/196.16 = 83.94/x
3. Step 3: Cross multiply
   142.16x = 196.16 × 83.94
4. Step 4: Simplify right side
   142.16x = 16,465.67
5. Step 5: Solve for x
   x = 16,465.67/142.16
6. Step 6: Final answer
   x = 115.82