Finding the Fourth Proportional to 142.30, 196.33 and 84.07

Step by Step Solution

1. Step 1: Write the proportion equation
   142.30 : 196.33 = 84.07 : x
2. Step 2: Convert to fraction form
   142.30/196.33 = 84.07/x
3. Step 3: Cross multiply
   142.30x = 196.33 × 84.07
4. Step 4: Simplify right side
   142.30x = 16,505.46
5. Step 5: Solve for x
   x = 16,505.46/142.30
6. Step 6: Final answer
   x = 115.99