Finding the Third Proportional to 1,638,339 and 3,591,609

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638,339 : 3,591,609 = 3,591,609 : x
2. Step 2: Convert to fraction form
   1,638,339/3,591,609 = 3,591,609/x
3. Step 3: Cross multiply
   1,638,339x = 3,591,609 × 3,591,609
4. Step 4: Simplify right side
   1,638,339x = 12,899,655,208,881
5. Step 5: Solve for x
   x = 12,899,655,208,881/1,638,339
6. Step 6: Final answer
   x = 7,873,617.86