Finding the Third Proportional to 12,389 and 25,390

Step by Step Solution

1. Step 1: Write the proportion equation
   12,389 : 25,390 = 25,390 : x
2. Step 2: Convert to fraction form
   12,389/25,390 = 25,390/x
3. Step 3: Cross multiply
   12,389x = 25,390 × 25,390
4. Step 4: Simplify right side
   12,389x = 644,652,100
5. Step 5: Solve for x
   x = 644,652,100/12,389
6. Step 6: Final answer
   x = 52,034.23