Finding the Third Proportional to 1,638,434 and 2,543,915

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638,434 : 2,543,915 = 2,543,915 : x
2. Step 2: Convert to fraction form
   1,638,434/2,543,915 = 2,543,915/x
3. Step 3: Cross multiply
   1,638,434x = 2,543,915 × 2,543,915
4. Step 4: Simplify right side
   1,638,434x = 6,471,503,527,225
5. Step 5: Solve for x
   x = 6,471,503,527,225/1,638,434
6. Step 6: Final answer
   x = 3,949,810.32