Finding the Fourth Proportional to 89.16, 123.12 and 64.73

Step by Step Solution

1. Step 1: Write the proportion equation
   89.16 : 123.12 = 64.73 : x
2. Step 2: Convert to fraction form
   89.16/123.12 = 64.73/x
3. Step 3: Cross multiply
   89.16x = 123.12 × 64.73
4. Step 4: Simplify right side
   89.16x = 7,968.94
5. Step 5: Solve for x
   x = 7,968.94/89.16
6. Step 6: Final answer
   x = 89.38