Finding the Third Proportional to 12,915,764,676 and 20,216,699,309

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915,764,676 : 20,216,699,309 = 20,216,699,309 : x
2. Step 2: Convert to fraction form
   12,915,764,676/20,216,699,309 = 20,216,699,309/x
3. Step 3: Cross multiply
   12,915,764,676x = 20,216,699,309 × 20,216,699,309
4. Step 4: Simplify right side
   12,915,764,676x = 408,714,930,950,521,094,144
5. Step 5: Solve for x
   x = 408,714,930,950,521,094,144/12,915,764,676
6. Step 6: Final answer
   x = 31,644,656,062.06