Finding the Third Proportional to 419,546.25 and 621,451

Step by Step Solution

1. Step 1: Write the proportion equation
   419,546.25 : 621,451 = 621,451 : x
2. Step 2: Convert to fraction form
   419,546.25/621,451 = 621,451/x
3. Step 3: Cross multiply
   419,546.25x = 621,451 × 621,451
4. Step 4: Simplify right side
   419,546.25x = 386,201,345,401
5. Step 5: Solve for x
   x = 386,201,345,401/419,546.25
6. Step 6: Final answer
   x = 920,521.50