Finding the Third Proportional to 640,018 and 1,400,564

Step by Step Solution

1. Step 1: Write the proportion equation
   640,018 : 1,400,564 = 1,400,564 : x
2. Step 2: Convert to fraction form
   640,018/1,400,564 = 1,400,564/x
3. Step 3: Cross multiply
   640,018x = 1,400,564 × 1,400,564
4. Step 4: Simplify right side
   640,018x = 1,961,579,518,096
5. Step 5: Solve for x
   x = 1,961,579,518,096/640,018
6. Step 6: Final answer
   x = 3,064,881.80