Finding the Third Proportional to 11,580 and 12,780

Step by Step Solution

1. Step 1: Write the proportion equation
   11,580 : 12,780 = 12,780 : x
2. Step 2: Convert to fraction form
   11,580/12,780 = 12,780/x
3. Step 3: Cross multiply
   11,580x = 12,780 × 12,780
4. Step 4: Simplify right side
   11,580x = 163,328,400
5. Step 5: Solve for x
   x = 163,328,400/11,580
6. Step 6: Final answer
   x = 14,104.35