Finding the Third Proportional to 12,717.75 and 19,691.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,717.75 : 19,691.25 = 19,691.25 : x
2. Step 2: Convert to fraction form
   12,717.75/19,691.25 = 19,691.25/x
3. Step 3: Cross multiply
   12,717.75x = 19,691.25 × 19,691.25
4. Step 4: Simplify right side
   12,717.75x = 387,745,326.56
5. Step 5: Solve for x
   x = 387,745,326.56/12,717.75
6. Step 6: Final answer
   x = 30,488.52