Finding the Fourth Proportional to 142.69, 196.80 and 101.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142.69 : 196.80 = 101.18 : x
2. Step 2: Convert to fraction form
   142.69/196.80 = 101.18/x
3. Step 3: Cross multiply
   142.69x = 196.80 × 101.18
4. Step 4: Simplify right side
   142.69x = 19,912.22
5. Step 5: Solve for x
   x = 19,912.22/142.69
6. Step 6: Final answer
   x = 139.55