Finding the Fourth Proportional to 89.37, 123.28 and 64.77

Step by Step Solution

1. Step 1: Write the proportion equation
   89.37 : 123.28 = 64.77 : x
2. Step 2: Convert to fraction form
   89.37/123.28 = 64.77/x
3. Step 3: Cross multiply
   89.37x = 123.28 × 64.77
4. Step 4: Simplify right side
   89.37x = 7,984.22
5. Step 5: Solve for x
   x = 7,984.22/89.37
6. Step 6: Final answer
   x = 89.34