Finding the Fourth Proportional to 142.29, 196.28 and 98.55

Step by Step Solution

1. Step 1: Write the proportion equation
   142.29 : 196.28 = 98.55 : x
2. Step 2: Convert to fraction form
   142.29/196.28 = 98.55/x
3. Step 3: Cross multiply
   142.29x = 196.28 × 98.55
4. Step 4: Simplify right side
   142.29x = 19,343.39
5. Step 5: Solve for x
   x = 19,343.39/142.29
6. Step 6: Final answer
   x = 135.94