Finding the Third Proportional to 309,139,716.75 and 666,705,620.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139,716.75 : 666,705,620.25 = 666,705,620.25 : x
2. Step 2: Convert to fraction form
   309,139,716.75/666,705,620.25 = 666,705,620.25/x
3. Step 3: Cross multiply
   309,139,716.75x = 666,705,620.25 × 666,705,620.25
4. Step 4: Simplify right side
   309,139,716.75x = 444,496,384,072,937,216
5. Step 5: Solve for x
   x = 444,496,384,072,937,216/309,139,716.75
6. Step 6: Final answer
   x = 1,437,849,490.02