Finding the Third Proportional to 2,603,640 and 5,640,312

Step by Step Solution

1. Step 1: Write the proportion equation
   2,603,640 : 5,640,312 = 5,640,312 : x
2. Step 2: Convert to fraction form
   2,603,640/5,640,312 = 5,640,312/x
3. Step 3: Cross multiply
   2,603,640x = 5,640,312 × 5,640,312
4. Step 4: Simplify right side
   2,603,640x = 31,813,119,457,344
5. Step 5: Solve for x
   x = 31,813,119,457,344/2,603,640
6. Step 6: Final answer
   x = 12,218,708.98