Finding the Fourth Proportional to 89.43, 134.12 and 28.55

Step by Step Solution

1. Step 1: Write the proportion equation
   89.43 : 134.12 = 28.55 : x
2. Step 2: Convert to fraction form
   89.43/134.12 = 28.55/x
3. Step 3: Cross multiply
   89.43x = 134.12 × 28.55
4. Step 4: Simplify right side
   89.43x = 3,828.31
5. Step 5: Solve for x
   x = 3,828.31/89.43
6. Step 6: Final answer
   x = 42.81