Finding the Fourth Proportional to 89.56, 123.62 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   89.56 : 123.62 = 64.72 : x
2. Step 2: Convert to fraction form
   89.56/123.62 = 64.72/x
3. Step 3: Cross multiply
   89.56x = 123.62 × 64.72
4. Step 4: Simplify right side
   89.56x = 8,000.69
5. Step 5: Solve for x
   x = 8,000.69/89.56
6. Step 6: Final answer
   x = 89.33