Finding the Fourth Proportional to 142.35, 213.50 and 61.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142.35 : 213.50 = 61.18 : x
2. Step 2: Convert to fraction form
   142.35/213.50 = 61.18/x
3. Step 3: Cross multiply
   142.35x = 213.50 × 61.18
4. Step 4: Simplify right side
   142.35x = 13,061.93
5. Step 5: Solve for x
   x = 13,061.93/142.35
6. Step 6: Final answer
   x = 91.76