Finding the Fourth Proportional to 111.65, 154.06 and 65.03

Step by Step Solution

1. Step 1: Write the proportion equation
   111.65 : 154.06 = 65.03 : x
2. Step 2: Convert to fraction form
   111.65/154.06 = 65.03/x
3. Step 3: Cross multiply
   111.65x = 154.06 × 65.03
4. Step 4: Simplify right side
   111.65x = 10,017.59
5. Step 5: Solve for x
   x = 10,017.59/111.65
6. Step 6: Final answer
   x = 89.73