Finding the Third Proportional to 309,139,317 and 666,704,817

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139,317 : 666,704,817 = 666,704,817 : x
2. Step 2: Convert to fraction form
   309,139,317/666,704,817 = 666,704,817/x
3. Step 3: Cross multiply
   309,139,317x = 666,704,817 × 666,704,817
4. Step 4: Simplify right side
   309,139,317x = 444,495,313,011,003,520
5. Step 5: Solve for x
   x = 444,495,313,011,003,520/309,139,317
6. Step 6: Final answer
   x = 1,437,847,884.65