Finding the Third Proportional to 643,908 and 1,398,528

Step by Step Solution

1. Step 1: Write the proportion equation
   643,908 : 1,398,528 = 1,398,528 : x
2. Step 2: Convert to fraction form
   643,908/1,398,528 = 1,398,528/x
3. Step 3: Cross multiply
   643,908x = 1,398,528 × 1,398,528
4. Step 4: Simplify right side
   643,908x = 1,955,880,566,784
5. Step 5: Solve for x
   x = 1,955,880,566,784/643,908
6. Step 6: Final answer
   x = 3,037,515.56