Finding the Third Proportional to 12,399 and 25,164

Step by Step Solution

1. Step 1: Write the proportion equation
   12,399 : 25,164 = 25,164 : x
2. Step 2: Convert to fraction form
   12,399/25,164 = 25,164/x
3. Step 3: Cross multiply
   12,399x = 25,164 × 25,164
4. Step 4: Simplify right side
   12,399x = 633,226,896
5. Step 5: Solve for x
   x = 633,226,896/12,399
6. Step 6: Final answer
   x = 51,070.80