Finding the Third Proportional to 9,168 and 12,640

Step by Step Solution

1. Step 1: Write the proportion equation
   9,168 : 12,640 = 12,640 : x
2. Step 2: Convert to fraction form
   9,168/12,640 = 12,640/x
3. Step 3: Cross multiply
   9,168x = 12,640 × 12,640
4. Step 4: Simplify right side
   9,168x = 159,769,600
5. Step 5: Solve for x
   x = 159,769,600/9,168
6. Step 6: Final answer
   x = 17,426.88