Finding the Third Proportional to 2,603,638 and 5,640,307

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603,638 : 5,640,307 = 5,640,307 : x
2. Step 2: Convert to fraction form
   2,603,638/5,640,307 = 5,640,307/x
3. Step 3: Cross multiply
   2,603,638x = 5,640,307 × 5,640,307
4. Step 4: Simplify right side
   2,603,638x = 31,813,063,054,249
5. Step 5: Solve for x
   x = 31,813,063,054,249/2,603,638
6. Step 6: Final answer
   x = 12,218,696.71