Finding the Third Proportional to 643,924 and 1,398,564

Step by Step Solution

1. Step 1: Write the proportion equation
   643,924 : 1,398,564 = 1,398,564 : x
2. Step 2: Convert to fraction form
   643,924/1,398,564 = 1,398,564/x
3. Step 3: Cross multiply
   643,924x = 1,398,564 × 1,398,564
4. Step 4: Simplify right side
   643,924x = 1,955,981,262,096
5. Step 5: Solve for x
   x = 1,955,981,262,096/643,924
6. Step 6: Final answer
   x = 3,037,596.46