Finding the Third Proportional to 726,216 and 1,687,560

Step by Step Solution

1. Step 1: Write the proportion equation
   726,216 : 1,687,560 = 1,687,560 : x
2. Step 2: Convert to fraction form
   726,216/1,687,560 = 1,687,560/x
3. Step 3: Cross multiply
   726,216x = 1,687,560 × 1,687,560
4. Step 4: Simplify right side
   726,216x = 2,847,858,753,600
5. Step 5: Solve for x
   x = 2,847,858,753,600/726,216
6. Step 6: Final answer
   x = 3,921,503.73