Finding the Third Proportional to 10,688 and 15,020

Step by Step Solution

1. Step 1: Write the proportion equation
   10,688 : 15,020 = 15,020 : x
2. Step 2: Convert to fraction form
   10,688/15,020 = 15,020/x
3. Step 3: Cross multiply
   10,688x = 15,020 × 15,020
4. Step 4: Simplify right side
   10,688x = 225,600,400
5. Step 5: Solve for x
   x = 225,600,400/10,688
6. Step 6: Final answer
   x = 21,107.82