Finding the Fourth Proportional to 142.57, 196.82 and 98.96

Step by Step Solution

1. Step 1: Write the proportion equation
   142.57 : 196.82 = 98.96 : x
2. Step 2: Convert to fraction form
   142.57/196.82 = 98.96/x
3. Step 3: Cross multiply
   142.57x = 196.82 × 98.96
4. Step 4: Simplify right side
   142.57x = 19,477.31
5. Step 5: Solve for x
   x = 19,477.31/142.57
6. Step 6: Final answer
   x = 136.62