Finding the Third Proportional to 557,839,209 and 1,216,120,911

Step by Step Solution

1. Step 1: Write the proportion equation
   557,839,209 : 1,216,120,911 = 1,216,120,911 : x
2. Step 2: Convert to fraction form
   557,839,209/1,216,120,911 = 1,216,120,911/x
3. Step 3: Cross multiply
   557,839,209x = 1,216,120,911 × 1,216,120,911
4. Step 4: Simplify right side
   557,839,209x = 1,478,950,070,171,469,824
5. Step 5: Solve for x
   x = 1,478,950,070,171,469,824/557,839,209
6. Step 6: Final answer
   x = 2,651,212,116.88