Finding the Third Proportional to 13,900 and 19,810

Step by Step Solution

1. Step 1: Write the proportion equation
   13,900 : 19,810 = 19,810 : x
2. Step 2: Convert to fraction form
   13,900/19,810 = 19,810/x
3. Step 3: Cross multiply
   13,900x = 19,810 × 19,810
4. Step 4: Simplify right side
   13,900x = 392,436,100
5. Step 5: Solve for x
   x = 392,436,100/13,900
6. Step 6: Final answer
   x = 28,232.81