Finding the Third Proportional to 290,839,152 and 636,405,864

Step by Step Solution

1. Step 1: Write the proportion equation
   290,839,152 : 636,405,864 = 636,405,864 : x
2. Step 2: Convert to fraction form
   290,839,152/636,405,864 = 636,405,864/x
3. Step 3: Cross multiply
   290,839,152x = 636,405,864 × 636,405,864
4. Step 4: Simplify right side
   290,839,152x = 405,012,423,733,586,496
5. Step 5: Solve for x
   x = 405,012,423,733,586,496/290,839,152
6. Step 6: Final answer
   x = 1,392,565,000.10