Finding the Third Proportional to 6,440 and 10,518

Step by Step Solution

1. Step 1: Write the proportion equation
   6,440 : 10,518 = 10,518 : x
2. Step 2: Convert to fraction form
   6,440/10,518 = 10,518/x
3. Step 3: Cross multiply
   6,440x = 10,518 × 10,518
4. Step 4: Simplify right side
   6,440x = 110,628,324
5. Step 5: Solve for x
   x = 110,628,324/6,440
6. Step 6: Final answer
   x = 17,178.31