Finding the Third Proportional to 287,969 and 619,405

Step by Step Solution

1. Step 1: Write the proportion equation
   287,969 : 619,405 = 619,405 : x
2. Step 2: Convert to fraction form
   287,969/619,405 = 619,405/x
3. Step 3: Cross multiply
   287,969x = 619,405 × 619,405
4. Step 4: Simplify right side
   287,969x = 383,662,554,025
5. Step 5: Solve for x
   x = 383,662,554,025/287,969
6. Step 6: Final answer
   x = 1,332,305.05