Finding the Third Proportional to 323,389.69 and 680,290.88

Step by Step Solution

1. Step 1: Write the proportion equation
   323,389.69 : 680,290.88 = 680,290.88 : x
2. Step 2: Convert to fraction form
   323,389.69/680,290.88 = 680,290.88/x
3. Step 3: Cross multiply
   323,389.69x = 680,290.88 × 680,290.88
4. Step 4: Simplify right side
   323,389.69x = 462,795,674,608.27
5. Step 5: Solve for x
   x = 462,795,674,608.27/323,389.69
6. Step 6: Final answer
   x = 1,431,077.40