Finding the Fourth Proportional to 142.77, 196.83 and 115.23

Step by Step Solution

1. Step 1: Write the proportion equation
   142.77 : 196.83 = 115.23 : x
2. Step 2: Convert to fraction form
   142.77/196.83 = 115.23/x
3. Step 3: Cross multiply
   142.77x = 196.83 × 115.23
4. Step 4: Simplify right side
   142.77x = 22,680.72
5. Step 5: Solve for x
   x = 22,680.72/142.77
6. Step 6: Final answer
   x = 158.86