Finding the Third Proportional to 685,458 and 1,487,556

Step by Step Solution

1. Step 1: Write the proportion equation
   685,458 : 1,487,556 = 1,487,556 : x
2. Step 2: Convert to fraction form
   685,458/1,487,556 = 1,487,556/x
3. Step 3: Cross multiply
   685,458x = 1,487,556 × 1,487,556
4. Step 4: Simplify right side
   685,458x = 2,212,822,853,136
5. Step 5: Solve for x
   x = 2,212,822,853,136/685,458
6. Step 6: Final answer
   x = 3,228,239.88