Finding the Third Proportional to 309,340.69 and 659,503.69

Step by Step Solution

1. Step 1: Write the proportion equation
   309,340.69 : 659,503.69 = 659,503.69 : x
2. Step 2: Convert to fraction form
   309,340.69/659,503.69 = 659,503.69/x
3. Step 3: Cross multiply
   309,340.69x = 659,503.69 × 659,503.69
4. Step 4: Simplify right side
   309,340.69x = 434,945,113,826.10
5. Step 5: Solve for x
   x = 434,945,113,826.10/309,340.69
6. Step 6: Final answer
   x = 1,406,039.14