Finding the Third Proportional to 18,481.50 and 21,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   18,481.50 : 21,721.50 = 21,721.50 : x
2. Step 2: Convert to fraction form
   18,481.50/21,721.50 = 21,721.50/x
3. Step 3: Cross multiply
   18,481.50x = 21,721.50 × 21,721.50
4. Step 4: Simplify right side
   18,481.50x = 471,823,562.25
5. Step 5: Solve for x
   x = 471,823,562.25/18,481.50
6. Step 6: Final answer
   x = 25,529.51