Finding the Third Proportional to 10,421.16 and 15,721.59

Step by Step Solution

1. Step 1: Write the proportion equation
   10,421.16 : 15,721.59 = 15,721.59 : x
2. Step 2: Convert to fraction form
   10,421.16/15,721.59 = 15,721.59/x
3. Step 3: Cross multiply
   10,421.16x = 15,721.59 × 15,721.59
4. Step 4: Simplify right side
   10,421.16x = 247,168,510.04
5. Step 5: Solve for x
   x = 247,168,510.04/10,421.16
6. Step 6: Final answer
   x = 23,717.95