Finding the Third Proportional to 287,678 and 450,300

Step by Step Solution

1. Step 1: Write the proportion equation
   287,678 : 450,300 = 450,300 : x
2. Step 2: Convert to fraction form
   287,678/450,300 = 450,300/x
3. Step 3: Cross multiply
   287,678x = 450,300 × 450,300
4. Step 4: Simplify right side
   287,678x = 202,770,090,000
5. Step 5: Solve for x
   x = 202,770,090,000/287,678
6. Step 6: Final answer
   x = 704,850.87