Finding the Third Proportional to 15,354 and 21,721.50

Step by Step Solution

1. Step 1: Write the proportion equation
   15,354 : 21,721.50 = 21,721.50 : x
2. Step 2: Convert to fraction form
   15,354/21,721.50 = 21,721.50/x
3. Step 3: Cross multiply
   15,354x = 21,721.50 × 21,721.50
4. Step 4: Simplify right side
   15,354x = 471,823,562.25
5. Step 5: Solve for x
   x = 471,823,562.25/15,354
6. Step 6: Final answer
   x = 30,729.68