Finding the Fourth Proportional to 142.17, 213.10 and 61.06

Step by Step Solution

1. Step 1: Write the proportion equation
   142.17 : 213.10 = 61.06 : x
2. Step 2: Convert to fraction form
   142.17/213.10 = 61.06/x
3. Step 3: Cross multiply
   142.17x = 213.10 × 61.06
4. Step 4: Simplify right side
   142.17x = 13,011.89
5. Step 5: Solve for x
   x = 13,011.89/142.17
6. Step 6: Final answer
   x = 91.52