Finding the Third Proportional to 8.72 and 19.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8.72 : 19.69 = 19.69 : x
2. Step 2: Convert to fraction form
   8.72/19.69 = 19.69/x
3. Step 3: Cross multiply
   8.72x = 19.69 × 19.69
4. Step 4: Simplify right side
   8.72x = 387.60
5. Step 5: Solve for x
   x = 387.60/8.72
6. Step 6: Final answer
   x = 44.46