Finding the Third Proportional to 408,948 and 620,779.50

Step by Step Solution

1. Step 1: Write the proportion equation
   408,948 : 620,779.50 = 620,779.50 : x
2. Step 2: Convert to fraction form
   408,948/620,779.50 = 620,779.50/x
3. Step 3: Cross multiply
   408,948x = 620,779.50 × 620,779.50
4. Step 4: Simplify right side
   408,948x = 385,367,187,620.25
5. Step 5: Solve for x
   x = 385,367,187,620.25/408,948
6. Step 6: Final answer
   x = 942,337.87