Finding the Fourth Proportional to 142.17, 213.15 and 101.50

Step by Step Solution

1. Step 1: Write the proportion equation
   142.17 : 213.15 = 101.50 : x
2. Step 2: Convert to fraction form
   142.17/213.15 = 101.50/x
3. Step 3: Cross multiply
   142.17x = 213.15 × 101.50
4. Step 4: Simplify right side
   142.17x = 21,633.15
5. Step 5: Solve for x
   x = 21,633.15/142.17
6. Step 6: Final answer
   x = 152.17