Finding the Fourth Proportional to 142.79, 196.61 and 124.37

Step by Step Solution

1. Step 1: Write the proportion equation
   142.79 : 196.61 = 124.37 : x
2. Step 2: Convert to fraction form
   142.79/196.61 = 124.37/x
3. Step 3: Cross multiply
   142.79x = 196.61 × 124.37
4. Step 4: Simplify right side
   142.79x = 24,451.76
5. Step 5: Solve for x
   x = 24,451.76/142.79
6. Step 6: Final answer
   x = 171.24