Finding the Fourth Proportional to 89.48, 123.38 and 64.92

Step by Step Solution

1. Step 1: Write the proportion equation
   89.48 : 123.38 = 64.92 : x
2. Step 2: Convert to fraction form
   89.48/123.38 = 64.92/x
3. Step 3: Cross multiply
   89.48x = 123.38 × 64.92
4. Step 4: Simplify right side
   89.48x = 8,009.83
5. Step 5: Solve for x
   x = 8,009.83/89.48
6. Step 6: Final answer
   x = 89.52