Finding the Fourth Proportional to 111.59, 154.02 and 64.97

Step by Step Solution

1. Step 1: Write the proportion equation
   111.59 : 154.02 = 64.97 : x
2. Step 2: Convert to fraction form
   111.59/154.02 = 64.97/x
3. Step 3: Cross multiply
   111.59x = 154.02 × 64.97
4. Step 4: Simplify right side
   111.59x = 10,007.31
5. Step 5: Solve for x
   x = 10,007.31/111.59
6. Step 6: Final answer
   x = 89.68