Finding the Third Proportional to 11,511 and 12,645

Step by Step Solution

1. Step 1: Write the proportion equation
   11,511 : 12,645 = 12,645 : x
2. Step 2: Convert to fraction form
   11,511/12,645 = 12,645/x
3. Step 3: Cross multiply
   11,511x = 12,645 × 12,645
4. Step 4: Simplify right side
   11,511x = 159,896,025
5. Step 5: Solve for x
   x = 159,896,025/11,511
6. Step 6: Final answer
   x = 13,890.72