Finding the Third Proportional to 8,780 and 13,900

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780 : 13,900 = 13,900 : x
2. Step 2: Convert to fraction form
   8,780/13,900 = 13,900/x
3. Step 3: Cross multiply
   8,780x = 13,900 × 13,900
4. Step 4: Simplify right side
   8,780x = 193,210,000
5. Step 5: Solve for x
   x = 193,210,000/8,780
6. Step 6: Final answer
   x = 22,005.69