Finding the Third Proportional to 779,920 and 1,687,776

Step by Step Solution

1. Step 1: Write the proportion equation
   779,920 : 1,687,776 = 1,687,776 : x
2. Step 2: Convert to fraction form
   779,920/1,687,776 = 1,687,776/x
3. Step 3: Cross multiply
   779,920x = 1,687,776 × 1,687,776
4. Step 4: Simplify right side
   779,920x = 2,848,587,826,176
5. Step 5: Solve for x
   x = 2,848,587,826,176/779,920
6. Step 6: Final answer
   x = 3,652,410.28