Finding the Third Proportional to 12,717.75 and 19,715.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,717.75 : 19,715.50 = 19,715.50 : x
2. Step 2: Convert to fraction form
   12,717.75/19,715.50 = 19,715.50/x
3. Step 3: Cross multiply
   12,717.75x = 19,715.50 × 19,715.50
4. Step 4: Simplify right side
   12,717.75x = 388,700,940.25
5. Step 5: Solve for x
   x = 388,700,940.25/12,717.75
6. Step 6: Final answer
   x = 30,563.66