Finding the Fourth Proportional to 142.27, 196.31 and 87.01

Step by Step Solution

1. Step 1: Write the proportion equation
   142.27 : 196.31 = 87.01 : x
2. Step 2: Convert to fraction form
   142.27/196.31 = 87.01/x
3. Step 3: Cross multiply
   142.27x = 196.31 × 87.01
4. Step 4: Simplify right side
   142.27x = 17,079.52
5. Step 5: Solve for x
   x = 17,079.52/142.27
6. Step 6: Final answer
   x = 120.05