Finding the Third Proportional to 726,228 and 1,687,590

Step by Step Solution

1. Step 1: Write the proportion equation
   726,228 : 1,687,590 = 1,687,590 : x
2. Step 2: Convert to fraction form
   726,228/1,687,590 = 1,687,590/x
3. Step 3: Cross multiply
   726,228x = 1,687,590 × 1,687,590
4. Step 4: Simplify right side
   726,228x = 2,847,960,008,100
5. Step 5: Solve for x
   x = 2,847,960,008,100/726,228
6. Step 6: Final answer
   x = 3,921,578.36