Finding the Fourth Proportional to 111.75, 154.25 and 65.16

Step by Step Solution

1. Step 1: Write the proportion equation
   111.75 : 154.25 = 65.16 : x
2. Step 2: Convert to fraction form
   111.75/154.25 = 65.16/x
3. Step 3: Cross multiply
   111.75x = 154.25 × 65.16
4. Step 4: Simplify right side
   111.75x = 10,050.60
5. Step 5: Solve for x
   x = 10,050.60/111.75
6. Step 6: Final answer
   x = 89.94