Finding the Third Proportional to 640,996 and 1,367,789

Step by Step Solution

1. Step 1: Write the proportion equation
   640,996 : 1,367,789 = 1,367,789 : x
2. Step 2: Convert to fraction form
   640,996/1,367,789 = 1,367,789/x
3. Step 3: Cross multiply
   640,996x = 1,367,789 × 1,367,789
4. Step 4: Simplify right side
   640,996x = 1,870,846,748,521
5. Step 5: Solve for x
   x = 1,870,846,748,521/640,996
6. Step 6: Final answer
   x = 2,918,655.89