Finding the Third Proportional to 640,364 and 1,380,040

Step by Step Solution

1. Step 1: Write the proportion equation
   640,364 : 1,380,040 = 1,380,040 : x
2. Step 2: Convert to fraction form
   640,364/1,380,040 = 1,380,040/x
3. Step 3: Cross multiply
   640,364x = 1,380,040 × 1,380,040
4. Step 4: Simplify right side
   640,364x = 1,904,510,401,600
5. Step 5: Solve for x
   x = 1,904,510,401,600/640,364
6. Step 6: Final answer
   x = 2,974,105.98