Finding the Fourth Proportional to 89.47, 134.20 and 28.61

Step by Step Solution

1. Step 1: Write the proportion equation
   89.47 : 134.20 = 28.61 : x
2. Step 2: Convert to fraction form
   89.47/134.20 = 28.61/x
3. Step 3: Cross multiply
   89.47x = 134.20 × 28.61
4. Step 4: Simplify right side
   89.47x = 3,839.32
5. Step 5: Solve for x
   x = 3,839.32/89.47
6. Step 6: Final answer
   x = 42.91