Finding the Fourth Proportional to 89.47, 123.49 and 64.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89.47 : 123.49 = 64.56 : x
2. Step 2: Convert to fraction form
   89.47/123.49 = 64.56/x
3. Step 3: Cross multiply
   89.47x = 123.49 × 64.56
4. Step 4: Simplify right side
   89.47x = 7,972.51
5. Step 5: Solve for x
   x = 7,972.51/89.47
6. Step 6: Final answer
   x = 89.11