Finding the Third Proportional to 989,721 and 2,206,890

Step by Step Solution

1. Step 1: Write the proportion equation
   989,721 : 2,206,890 = 2,206,890 : x
2. Step 2: Convert to fraction form
   989,721/2,206,890 = 2,206,890/x
3. Step 3: Cross multiply
   989,721x = 2,206,890 × 2,206,890
4. Step 4: Simplify right side
   989,721x = 4,870,363,472,100
5. Step 5: Solve for x
   x = 4,870,363,472,100/989,721
6. Step 6: Final answer
   x = 4,920,945.87