Finding the Third Proportional to 12,391 and 25,215

Step by Step Solution

1. Step 1: Write the proportion equation
   12,391 : 25,215 = 25,215 : x
2. Step 2: Convert to fraction form
   12,391/25,215 = 25,215/x
3. Step 3: Cross multiply
   12,391x = 25,215 × 25,215
4. Step 4: Simplify right side
   12,391x = 635,796,225
5. Step 5: Solve for x
   x = 635,796,225/12,391
6. Step 6: Final answer
   x = 51,311.13