Finding the Third Proportional to 19,912,398 and 31,288,419

Step by Step Solution

1. Step 1: Write the proportion equation
   19,912,398 : 31,288,419 = 31,288,419 : x
2. Step 2: Convert to fraction form
   19,912,398/31,288,419 = 31,288,419/x
3. Step 3: Cross multiply
   19,912,398x = 31,288,419 × 31,288,419
4. Step 4: Simplify right side
   19,912,398x = 978,965,163,519,561
5. Step 5: Solve for x
   x = 978,965,163,519,561/19,912,398
6. Step 6: Final answer
   x = 49,163,599.66