Finding the Third Proportional to 428,868 and 628,972.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,868 : 628,972.50 = 628,972.50 : x
2. Step 2: Convert to fraction form
   428,868/628,972.50 = 628,972.50/x
3. Step 3: Cross multiply
   428,868x = 628,972.50 × 628,972.50
4. Step 4: Simplify right side
   428,868x = 395,606,405,756.25
5. Step 5: Solve for x
   x = 395,606,405,756.25/428,868
6. Step 6: Final answer
   x = 922,443.28