Finding the Third Proportional to 9,780 and 13,287

Step by Step Solution

1. Step 1: Write the proportion equation
   9,780 : 13,287 = 13,287 : x
2. Step 2: Convert to fraction form
   9,780/13,287 = 13,287/x
3. Step 3: Cross multiply
   9,780x = 13,287 × 13,287
4. Step 4: Simplify right side
   9,780x = 176,544,369
5. Step 5: Solve for x
   x = 176,544,369/9,780
6. Step 6: Final answer
   x = 18,051.57