Finding the Third Proportional to 12,790 and 30,517

Step by Step Solution

1. Step 1: Write the proportion equation
   12,790 : 30,517 = 30,517 : x
2. Step 2: Convert to fraction form
   12,790/30,517 = 30,517/x
3. Step 3: Cross multiply
   12,790x = 30,517 × 30,517
4. Step 4: Simplify right side
   12,790x = 931,287,289
5. Step 5: Solve for x
   x = 931,287,289/12,790
6. Step 6: Final answer
   x = 72,813.71