Finding the Third Proportional to 21,472 and 28,680

Step by Step Solution

1. Step 1: Write the proportion equation
   21,472 : 28,680 = 28,680 : x
2. Step 2: Convert to fraction form
   21,472/28,680 = 28,680/x
3. Step 3: Cross multiply
   21,472x = 28,680 × 28,680
4. Step 4: Simplify right side
   21,472x = 822,542,400
5. Step 5: Solve for x
   x = 822,542,400/21,472
6. Step 6: Final answer
   x = 38,307.68