Finding the Third Proportional to 688,731 and 1,085,919

Step by Step Solution

1. Step 1: Write the proportion equation
   688,731 : 1,085,919 = 1,085,919 : x
2. Step 2: Convert to fraction form
   688,731/1,085,919 = 1,085,919/x
3. Step 3: Cross multiply
   688,731x = 1,085,919 × 1,085,919
4. Step 4: Simplify right side
   688,731x = 1,179,220,074,561
5. Step 5: Solve for x
   x = 1,179,220,074,561/688,731
6. Step 6: Final answer
   x = 1,712,163.49