Finding the Fourth Proportional to 142.38, 196.53 and 111.39

Step by Step Solution

1. Step 1: Write the proportion equation
   142.38 : 196.53 = 111.39 : x
2. Step 2: Convert to fraction form
   142.38/196.53 = 111.39/x
3. Step 3: Cross multiply
   142.38x = 196.53 × 111.39
4. Step 4: Simplify right side
   142.38x = 21,891.48
5. Step 5: Solve for x
   x = 21,891.48/142.38
6. Step 6: Final answer
   x = 153.75