Finding the Fourth Proportional to 89.58, 134.38 and 28.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89.58 : 134.38 = 28.72 : x
2. Step 2: Convert to fraction form
   89.58/134.38 = 28.72/x
3. Step 3: Cross multiply
   89.58x = 134.38 × 28.72
4. Step 4: Simplify right side
   89.58x = 3,859.39
5. Step 5: Solve for x
   x = 3,859.39/89.58
6. Step 6: Final answer
   x = 43.08