Finding the Third Proportional to 21,711 and 28,678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,711 : 28,678.50 = 28,678.50 : x
2. Step 2: Convert to fraction form
   21,711/28,678.50 = 28,678.50/x
3. Step 3: Cross multiply
   21,711x = 28,678.50 × 28,678.50
4. Step 4: Simplify right side
   21,711x = 822,456,362.25
5. Step 5: Solve for x
   x = 822,456,362.25/21,711
6. Step 6: Final answer
   x = 37,882.01