Finding the Fourth Proportional to 142.18, 213.25 and 59.88

Step by Step Solution

1. Step 1: Write the proportion equation
   142.18 : 213.25 = 59.88 : x
2. Step 2: Convert to fraction form
   142.18/213.25 = 59.88/x
3. Step 3: Cross multiply
   142.18x = 213.25 × 59.88
4. Step 4: Simplify right side
   142.18x = 12,768.34
5. Step 5: Solve for x
   x = 12,768.34/142.18
6. Step 6: Final answer
   x = 89.81