Finding the Fourth Proportional to 89.43, 123.36 and 64.82

Step by Step Solution

1. Step 1: Write the proportion equation
   89.43 : 123.36 = 64.82 : x
2. Step 2: Convert to fraction form
   89.43/123.36 = 64.82/x
3. Step 3: Cross multiply
   89.43x = 123.36 × 64.82
4. Step 4: Simplify right side
   89.43x = 7,996.20
5. Step 5: Solve for x
   x = 7,996.20/89.43
6. Step 6: Final answer
   x = 89.41