Finding the Third Proportional to 1,638,432 and 2,543,912

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638,432 : 2,543,912 = 2,543,912 : x
2. Step 2: Convert to fraction form
   1,638,432/2,543,912 = 2,543,912/x
3. Step 3: Cross multiply
   1,638,432x = 2,543,912 × 2,543,912
4. Step 4: Simplify right side
   1,638,432x = 6,471,488,263,744
5. Step 5: Solve for x
   x = 6,471,488,263,744/1,638,432
6. Step 6: Final answer
   x = 3,949,805.83