Finding the Third Proportional to 397,909 and 585,118.50

Step by Step Solution

1. Step 1: Write the proportion equation
   397,909 : 585,118.50 = 585,118.50 : x
2. Step 2: Convert to fraction form
   397,909/585,118.50 = 585,118.50/x
3. Step 3: Cross multiply
   397,909x = 585,118.50 × 585,118.50
4. Step 4: Simplify right side
   397,909x = 342,363,659,042.25
5. Step 5: Solve for x
   x = 342,363,659,042.25/397,909
6. Step 6: Final answer
   x = 860,406.92