Finding the Fourth Proportional to 85.42, 128.15 and 24.55

Step by Step Solution

1. Step 1: Write the proportion equation
   85.42 : 128.15 = 24.55 : x
2. Step 2: Convert to fraction form
   85.42/128.15 = 24.55/x
3. Step 3: Cross multiply
   85.42x = 128.15 × 24.55
4. Step 4: Simplify right side
   85.42x = 3,146.08
5. Step 5: Solve for x
   x = 3,146.08/85.42
6. Step 6: Final answer
   x = 36.83