Finding the Fourth Proportional to 142.10, 196.07 and 83.89

Step by Step Solution

1. Step 1: Write the proportion equation
   142.10 : 196.07 = 83.89 : x
2. Step 2: Convert to fraction form
   142.10/196.07 = 83.89/x
3. Step 3: Cross multiply
   142.10x = 196.07 × 83.89
4. Step 4: Simplify right side
   142.10x = 16,446.91
5. Step 5: Solve for x
   x = 16,446.91/142.10
6. Step 6: Final answer
   x = 115.74