Finding the Third Proportional to 309,109.50 and 659,044.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,109.50 : 659,044.50 = 659,044.50 : x
2. Step 2: Convert to fraction form
   309,109.50/659,044.50 = 659,044.50/x
3. Step 3: Cross multiply
   309,109.50x = 659,044.50 × 659,044.50
4. Step 4: Simplify right side
   309,109.50x = 434,339,652,980.25
5. Step 5: Solve for x
   x = 434,339,652,980.25/309,109.50
6. Step 6: Final answer
   x = 1,405,132.01