Finding the Third Proportional to 643,966 and 1,398,550

Step by Step Solution

1. Step 1: Write the proportion equation
   643,966 : 1,398,550 = 1,398,550 : x
2. Step 2: Convert to fraction form
   643,966/1,398,550 = 1,398,550/x
3. Step 3: Cross multiply
   643,966x = 1,398,550 × 1,398,550
4. Step 4: Simplify right side
   643,966x = 1,955,942,102,500
5. Step 5: Solve for x
   x = 1,955,942,102,500/643,966
6. Step 6: Final answer
   x = 3,037,337.53