Finding the Third Proportional to 431,646 and 675,648

Step by Step Solution

1. Step 1: Write the proportion equation
   431,646 : 675,648 = 675,648 : x
2. Step 2: Convert to fraction form
   431,646/675,648 = 675,648/x
3. Step 3: Cross multiply
   431,646x = 675,648 × 675,648
4. Step 4: Simplify right side
   431,646x = 456,500,219,904
5. Step 5: Solve for x
   x = 456,500,219,904/431,646
6. Step 6: Final answer
   x = 1,057,580.10