Finding the Third Proportional to 12,688 and 18,960

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688 : 18,960 = 18,960 : x
2. Step 2: Convert to fraction form
   12,688/18,960 = 18,960/x
3. Step 3: Cross multiply
   12,688x = 18,960 × 18,960
4. Step 4: Simplify right side
   12,688x = 359,481,600
5. Step 5: Solve for x
   x = 359,481,600/12,688
6. Step 6: Final answer
   x = 28,332.41