Finding the Third Proportional to 309,139,690.50 and 666,705,572.25

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139,690.50 : 666,705,572.25 = 666,705,572.25 : x
2. Step 2: Convert to fraction form
   309,139,690.50/666,705,572.25 = 666,705,572.25/x
3. Step 3: Cross multiply
   309,139,690.50x = 666,705,572.25 × 666,705,572.25
4. Step 4: Simplify right side
   309,139,690.50x = 444,496,320,069,200,000
5. Step 5: Solve for x
   x = 444,496,320,069,200,000/309,139,690.50
6. Step 6: Final answer
   x = 1,437,849,405.07