Finding the Third Proportional to 448,764 and 620,200.50

Step by Step Solution

1. Step 1: Write the proportion equation
   448,764 : 620,200.50 = 620,200.50 : x
2. Step 2: Convert to fraction form
   448,764/620,200.50 = 620,200.50/x
3. Step 3: Cross multiply
   448,764x = 620,200.50 × 620,200.50
4. Step 4: Simplify right side
   448,764x = 384,648,660,200.25
5. Step 5: Solve for x
   x = 384,648,660,200.25/448,764
6. Step 6: Final answer
   x = 857,129.05