Finding the Fourth Proportional to 89.28, 134.15 and 43.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89.28 : 134.15 = 43.72 : x
2. Step 2: Convert to fraction form
   89.28/134.15 = 43.72/x
3. Step 3: Cross multiply
   89.28x = 134.15 × 43.72
4. Step 4: Simplify right side
   89.28x = 5,864.48
5. Step 5: Solve for x
   x = 5,864.48/89.28
6. Step 6: Final answer
   x = 65.69