Finding the Third Proportional to 428,859 and 628,960.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,859 : 628,960.50 = 628,960.50 : x
2. Step 2: Convert to fraction form
   428,859/628,960.50 = 628,960.50/x
3. Step 3: Cross multiply
   428,859x = 628,960.50 × 628,960.50
4. Step 4: Simplify right side
   428,859x = 395,591,310,560.25
5. Step 5: Solve for x
   x = 395,591,310,560.25/428,859
6. Step 6: Final answer
   x = 922,427.44