Finding the Fourth Proportional to 142.18, 213.29 and 61.03

Step by Step Solution

1. Step 1: Write the proportion equation
   142.18 : 213.29 = 61.03 : x
2. Step 2: Convert to fraction form
   142.18/213.29 = 61.03/x
3. Step 3: Cross multiply
   142.18x = 213.29 × 61.03
4. Step 4: Simplify right side
   142.18x = 13,016.78
5. Step 5: Solve for x
   x = 13,016.78/142.18
6. Step 6: Final answer
   x = 91.55