Finding the Fourth Proportional to 142.56, 196.38 and 109.62

Step by Step Solution

1. Step 1: Write the proportion equation
   142.56 : 196.38 = 109.62 : x
2. Step 2: Convert to fraction form
   142.56/196.38 = 109.62/x
3. Step 3: Cross multiply
   142.56x = 196.38 × 109.62
4. Step 4: Simplify right side
   142.56x = 21,527.18
5. Step 5: Solve for x
   x = 21,527.18/142.56
6. Step 6: Final answer
   x = 151.00