Finding the Fourth Proportional to 89.99, 134.94 and 28.27

Step by Step Solution

1. Step 1: Write the proportion equation
   89.99 : 134.94 = 28.27 : x
2. Step 2: Convert to fraction form
   89.99/134.94 = 28.27/x
3. Step 3: Cross multiply
   89.99x = 134.94 × 28.27
4. Step 4: Simplify right side
   89.99x = 3,815.03
5. Step 5: Solve for x
   x = 3,815.03/89.99
6. Step 6: Final answer
   x = 42.39