Finding the Fourth Proportional to 142.38, 196.56 and 109.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142.38 : 196.56 = 109.56 : x
2. Step 2: Convert to fraction form
   142.38/196.56 = 109.56/x
3. Step 3: Cross multiply
   142.38x = 196.56 × 109.56
4. Step 4: Simplify right side
   142.38x = 21,535.11
5. Step 5: Solve for x
   x = 21,535.11/142.38
6. Step 6: Final answer
   x = 151.25