Finding the Third Proportional to 686,508 and 1,487,388

Step by Step Solution

1. Step 1: Write the proportion equation
   686,508 : 1,487,388 = 1,487,388 : x
2. Step 2: Convert to fraction form
   686,508/1,487,388 = 1,487,388/x
3. Step 3: Cross multiply
   686,508x = 1,487,388 × 1,487,388
4. Step 4: Simplify right side
   686,508x = 2,212,323,062,544
5. Step 5: Solve for x
   x = 2,212,323,062,544/686,508
6. Step 6: Final answer
   x = 3,222,574.34