Finding the Third Proportional to 408,934.50 and 620,760

Step by Step Solution

1. Step 1: Write the proportion equation
   408,934.50 : 620,760 = 620,760 : x
2. Step 2: Convert to fraction form
   408,934.50/620,760 = 620,760/x
3. Step 3: Cross multiply
   408,934.50x = 620,760 × 620,760
4. Step 4: Simplify right side
   408,934.50x = 385,342,977,600
5. Step 5: Solve for x
   x = 385,342,977,600/408,934.50
6. Step 6: Final answer
   x = 942,309.78