Finding the Third Proportional to 6,688 and 10,240

Step by Step Solution

1. Step 1: Write the proportion equation
   6,688 : 10,240 = 10,240 : x
2. Step 2: Convert to fraction form
   6,688/10,240 = 10,240/x
3. Step 3: Cross multiply
   6,688x = 10,240 × 10,240
4. Step 4: Simplify right side
   6,688x = 104,857,600
5. Step 5: Solve for x
   x = 104,857,600/6,688
6. Step 6: Final answer
   x = 15,678.47