Finding the Third Proportional to 1,638,436 and 2,543,918

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638,436 : 2,543,918 = 2,543,918 : x
2. Step 2: Convert to fraction form
   1,638,436/2,543,918 = 2,543,918/x
3. Step 3: Cross multiply
   1,638,436x = 2,543,918 × 2,543,918
4. Step 4: Simplify right side
   1,638,436x = 6,471,518,790,724
5. Step 5: Solve for x
   x = 6,471,518,790,724/1,638,436
6. Step 6: Final answer
   x = 3,949,814.82