Finding the Third Proportional to 289,057.50 and 622,404

Step by Step Solution

1. Step 1: Write the proportion equation
   289,057.50 : 622,404 = 622,404 : x
2. Step 2: Convert to fraction form
   289,057.50/622,404 = 622,404/x
3. Step 3: Cross multiply
   289,057.50x = 622,404 × 622,404
4. Step 4: Simplify right side
   289,057.50x = 387,386,739,216
5. Step 5: Solve for x
   x = 387,386,739,216/289,057.50
6. Step 6: Final answer
   x = 1,340,171.90