Finding the Third Proportional to 12,688 and 18,072

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688 : 18,072 = 18,072 : x
2. Step 2: Convert to fraction form
   12,688/18,072 = 18,072/x
3. Step 3: Cross multiply
   12,688x = 18,072 × 18,072
4. Step 4: Simplify right side
   12,688x = 326,597,184
5. Step 5: Solve for x
   x = 326,597,184/12,688
6. Step 6: Final answer
   x = 25,740.64