Finding the Third Proportional to 12,678 and 18,947

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678 : 18,947 = 18,947 : x
2. Step 2: Convert to fraction form
   12,678/18,947 = 18,947/x
3. Step 3: Cross multiply
   12,678x = 18,947 × 18,947
4. Step 4: Simplify right side
   12,678x = 358,988,809
5. Step 5: Solve for x
   x = 358,988,809/12,678
6. Step 6: Final answer
   x = 28,315.89