Finding the Third Proportional to 12,986,408 and 20,562,555

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986,408 : 20,562,555 = 20,562,555 : x
2. Step 2: Convert to fraction form
   12,986,408/20,562,555 = 20,562,555/x
3. Step 3: Cross multiply
   12,986,408x = 20,562,555 × 20,562,555
4. Step 4: Simplify right side
   12,986,408x = 422,818,668,128,025
5. Step 5: Solve for x
   x = 422,818,668,128,025/12,986,408
6. Step 6: Final answer
   x = 32,558,554.15