Finding the Third Proportional to 290,839,150 and 636,405,860

Step by Step Solution

1. Step 1: Write the proportion equation
   290,839,150 : 636,405,860 = 636,405,860 : x
2. Step 2: Convert to fraction form
   290,839,150/636,405,860 = 636,405,860/x
3. Step 3: Cross multiply
   290,839,150x = 636,405,860 × 636,405,860
4. Step 4: Simplify right side
   290,839,150x = 405,012,418,642,339,584
5. Step 5: Solve for x
   x = 405,012,418,642,339,584/290,839,150
6. Step 6: Final answer
   x = 1,392,564,992.17