Finding the Third Proportional to 15,715.50 and 20,981.25

Step by Step Solution

1. Step 1: Write the proportion equation
   15,715.50 : 20,981.25 = 20,981.25 : x
2. Step 2: Convert to fraction form
   15,715.50/20,981.25 = 20,981.25/x
3. Step 3: Cross multiply
   15,715.50x = 20,981.25 × 20,981.25
4. Step 4: Simplify right side
   15,715.50x = 440,212,851.56
5. Step 5: Solve for x
   x = 440,212,851.56/15,715.50
6. Step 6: Final answer
   x = 28,011.38