Finding the Third Proportional to 12,200 and 15,960

Step by Step Solution

1. Step 1: Write the proportion equation
   12,200 : 15,960 = 15,960 : x
2. Step 2: Convert to fraction form
   12,200/15,960 = 15,960/x
3. Step 3: Cross multiply
   12,200x = 15,960 × 15,960
4. Step 4: Simplify right side
   12,200x = 254,721,600
5. Step 5: Solve for x
   x = 254,721,600/12,200
6. Step 6: Final answer
   x = 20,878.82