Finding the Third Proportional to 12,743,555,304 and 19,990,877,621

Step by Step Solution

1. Step 1: Write the proportion equation
   12,743,555,304 : 19,990,877,621 = 19,990,877,621 : x
2. Step 2: Convert to fraction form
   12,743,555,304/19,990,877,621 = 19,990,877,621/x
3. Step 3: Cross multiply
   12,743,555,304x = 19,990,877,621 × 19,990,877,621
4. Step 4: Simplify right side
   12,743,555,304x = 399,635,188,057,798,606,848
5. Step 5: Solve for x
   x = 399,635,188,057,798,606,848/12,743,555,304
6. Step 6: Final answer
   x = 31,359,787,635.74