Finding the Fourth Proportional to 89.25, 123.12 and 64.71

Step by Step Solution

1. Step 1: Write the proportion equation
   89.25 : 123.12 = 64.71 : x
2. Step 2: Convert to fraction form
   89.25/123.12 = 64.71/x
3. Step 3: Cross multiply
   89.25x = 123.12 × 64.71
4. Step 4: Simplify right side
   89.25x = 7,967.10
5. Step 5: Solve for x
   x = 7,967.10/89.25
6. Step 6: Final answer
   x = 89.27