Finding the Third Proportional to 726,390 and 1,687,994

Step by Step Solution

1. Step 1: Write the proportion equation
   726,390 : 1,687,994 = 1,687,994 : x
2. Step 2: Convert to fraction form
   726,390/1,687,994 = 1,687,994/x
3. Step 3: Cross multiply
   726,390x = 1,687,994 × 1,687,994
4. Step 4: Simplify right side
   726,390x = 2,849,323,744,036
5. Step 5: Solve for x
   x = 2,849,323,744,036/726,390
6. Step 6: Final answer
   x = 3,922,581.18