Finding the Third Proportional to 12,390,865 and 25,800,007

Step by Step Solution

1. Step 1: Write the proportion equation
   12,390,865 : 25,800,007 = 25,800,007 : x
2. Step 2: Convert to fraction form
   12,390,865/25,800,007 = 25,800,007/x
3. Step 3: Cross multiply
   12,390,865x = 25,800,007 × 25,800,007
4. Step 4: Simplify right side
   12,390,865x = 665,640,361,200,049
5. Step 5: Solve for x
   x = 665,640,361,200,049/12,390,865
6. Step 6: Final answer
   x = 53,720,249.65