Finding the Third Proportional to 12,490 and 16,223

Step by Step Solution

1. Step 1: Write the proportion equation
   12,490 : 16,223 = 16,223 : x
2. Step 2: Convert to fraction form
   12,490/16,223 = 16,223/x
3. Step 3: Cross multiply
   12,490x = 16,223 × 16,223
4. Step 4: Simplify right side
   12,490x = 263,185,729
5. Step 5: Solve for x
   x = 263,185,729/12,490
6. Step 6: Final answer
   x = 21,071.72