Finding the Fourth Proportional to 89.30, 123.17 and 64.71

Step by Step Solution

1. Step 1: Write the proportion equation
   89.30 : 123.17 = 64.71 : x
2. Step 2: Convert to fraction form
   89.30/123.17 = 64.71/x
3. Step 3: Cross multiply
   89.30x = 123.17 × 64.71
4. Step 4: Simplify right side
   89.30x = 7,970.01
5. Step 5: Solve for x
   x = 7,970.01/89.30
6. Step 6: Final answer
   x = 89.25