Finding the Third Proportional to 643,804 and 1,385,784

Step by Step Solution

1. Step 1: Write the proportion equation
   643,804 : 1,385,784 = 1,385,784 : x
2. Step 2: Convert to fraction form
   643,804/1,385,784 = 1,385,784/x
3. Step 3: Cross multiply
   643,804x = 1,385,784 × 1,385,784
4. Step 4: Simplify right side
   643,804x = 1,920,397,294,656
5. Step 5: Solve for x
   x = 1,920,397,294,656/643,804
6. Step 6: Final answer
   x = 2,982,891.21