Finding the Fourth Proportional to 89.39, 134.10 and 28.54

Step by Step Solution

1. Step 1: Write the proportion equation
   89.39 : 134.10 = 28.54 : x
2. Step 2: Convert to fraction form
   89.39/134.10 = 28.54/x
3. Step 3: Cross multiply
   89.39x = 134.10 × 28.54
4. Step 4: Simplify right side
   89.39x = 3,826.88
5. Step 5: Solve for x
   x = 3,826.88/89.39
6. Step 6: Final answer
   x = 42.81