Finding the Third Proportional to 2,639,690 and 4,117,287

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639,690 : 4,117,287 = 4,117,287 : x
2. Step 2: Convert to fraction form
   2,639,690/4,117,287 = 4,117,287/x
3. Step 3: Cross multiply
   2,639,690x = 4,117,287 × 4,117,287
4. Step 4: Simplify right side
   2,639,690x = 16,952,052,240,369
5. Step 5: Solve for x
   x = 16,952,052,240,369/2,639,690
6. Step 6: Final answer
   x = 6,421,986.01