Finding the Third Proportional to 111.29 and 154.09

Step by Step Solution

1. Step 1: Write the proportion equation
   111.29 : 154.09 = 154.09 : x
2. Step 2: Convert to fraction form
   111.29/154.09 = 154.09/x
3. Step 3: Cross multiply
   111.29x = 154.09 × 154.09
4. Step 4: Simplify right side
   111.29x = 23,745.23
5. Step 5: Solve for x
   x = 23,745.23/111.29
6. Step 6: Final answer
   x = 213.36