Finding the Fourth Proportional to 142.14, 196.39 and 123.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142.14 : 196.39 = 123.72 : x
2. Step 2: Convert to fraction form
   142.14/196.39 = 123.72/x
3. Step 3: Cross multiply
   142.14x = 196.39 × 123.72
4. Step 4: Simplify right side
   142.14x = 24,297.37
5. Step 5: Solve for x
   x = 24,297.37/142.14
6. Step 6: Final answer
   x = 170.94