Finding the Fourth Proportional to 89.16, 133.62 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89.16 : 133.62 = 64.72 : x
2. Step 2: Convert to fraction form
   89.16/133.62 = 64.72/x
3. Step 3: Cross multiply
   89.16x = 133.62 × 64.72
4. Step 4: Simplify right side
   89.16x = 8,647.89
5. Step 5: Solve for x
   x = 8,647.89/89.16
6. Step 6: Final answer
   x = 96.99