Finding the Third Proportional to 1,155,315 and 1,690,189

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155,315 : 1,690,189 = 1,690,189 : x
2. Step 2: Convert to fraction form
   1,155,315/1,690,189 = 1,690,189/x
3. Step 3: Cross multiply
   1,155,315x = 1,690,189 × 1,690,189
4. Step 4: Simplify right side
   1,155,315x = 2,856,738,855,721
5. Step 5: Solve for x
   x = 2,856,738,855,721/1,155,315
6. Step 6: Final answer
   x = 2,472,692.60