Finding the Third Proportional to 1,638,328 and 3,591,585

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638,328 : 3,591,585 = 3,591,585 : x
2. Step 2: Convert to fraction form
   1,638,328/3,591,585 = 3,591,585/x
3. Step 3: Cross multiply
   1,638,328x = 3,591,585 × 3,591,585
4. Step 4: Simplify right side
   1,638,328x = 12,899,482,812,225
5. Step 5: Solve for x
   x = 12,899,482,812,225/1,638,328
6. Step 6: Final answer
   x = 7,873,565.50