Finding the Third Proportional to 287,956.50 and 628,401

Step by Step Solution

1. Step 1: Write the proportion equation
   287,956.50 : 628,401 = 628,401 : x
2. Step 2: Convert to fraction form
   287,956.50/628,401 = 628,401/x
3. Step 3: Cross multiply
   287,956.50x = 628,401 × 628,401
4. Step 4: Simplify right side
   287,956.50x = 394,887,816,801
5. Step 5: Solve for x
   x = 394,887,816,801/287,956.50
6. Step 6: Final answer
   x = 1,371,345.38