Finding the Fourth Proportional to 142.55, 213.69 and 51.32

Step by Step Solution

1. Step 1: Write the proportion equation
   142.55 : 213.69 = 51.32 : x
2. Step 2: Convert to fraction form
   142.55/213.69 = 51.32/x
3. Step 3: Cross multiply
   142.55x = 213.69 × 51.32
4. Step 4: Simplify right side
   142.55x = 10,965.50
5. Step 5: Solve for x
   x = 10,965.50/142.55
6. Step 6: Final answer
   x = 76.93