Finding the Third Proportional to 21,072 and 28,616

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072 : 28,616 = 28,616 : x
2. Step 2: Convert to fraction form
   21,072/28,616 = 28,616/x
3. Step 3: Cross multiply
   21,072x = 28,616 × 28,616
4. Step 4: Simplify right side
   21,072x = 818,875,456
5. Step 5: Solve for x
   x = 818,875,456/21,072
6. Step 6: Final answer
   x = 38,860.83