Finding the Fourth Proportional to 142.70, 196.82 and 98.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142.70 : 196.82 = 98.42 : x
2. Step 2: Convert to fraction form
   142.70/196.82 = 98.42/x
3. Step 3: Cross multiply
   142.70x = 196.82 × 98.42
4. Step 4: Simplify right side
   142.70x = 19,371.02
5. Step 5: Solve for x
   x = 19,371.02/142.70
6. Step 6: Final answer
   x = 135.75