Finding the Third Proportional to 309,139,791.75 and 666,705,769.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,139,791.75 : 666,705,769.50 = 666,705,769.50 : x
2. Step 2: Convert to fraction form
   309,139,791.75/666,705,769.50 = 666,705,769.50/x
3. Step 3: Cross multiply
   309,139,791.75x = 666,705,769.50 × 666,705,769.50
4. Step 4: Simplify right side
   309,139,791.75x = 444,496,583,084,587,136
5. Step 5: Solve for x
   x = 444,496,583,084,587,136/309,139,791.75
6. Step 6: Final answer
   x = 1,437,849,784.94