Finding the Fourth Proportional to 142.32, 196.39 and 83.31

Step by Step Solution

1. Step 1: Write the proportion equation
   142.32 : 196.39 = 83.31 : x
2. Step 2: Convert to fraction form
   142.32/196.39 = 83.31/x
3. Step 3: Cross multiply
   142.32x = 196.39 × 83.31
4. Step 4: Simplify right side
   142.32x = 16,361.36
5. Step 5: Solve for x
   x = 16,361.36/142.32
6. Step 6: Final answer
   x = 114.96