Finding the Third Proportional to 717,644 and 1,691,688

Step by Step Solution

1. Step 1: Write the proportion equation
   717,644 : 1,691,688 = 1,691,688 : x
2. Step 2: Convert to fraction form
   717,644/1,691,688 = 1,691,688/x
3. Step 3: Cross multiply
   717,644x = 1,691,688 × 1,691,688
4. Step 4: Simplify right side
   717,644x = 2,861,808,289,344
5. Step 5: Solve for x
   x = 2,861,808,289,344/717,644
6. Step 6: Final answer
   x = 3,987,782.65