Finding the Third Proportional to 428,865 and 628,969.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,865 : 628,969.50 = 628,969.50 : x
2. Step 2: Convert to fraction form
   428,865/628,969.50 = 628,969.50/x
3. Step 3: Cross multiply
   428,865x = 628,969.50 × 628,969.50
4. Step 4: Simplify right side
   428,865x = 395,602,631,930.25
5. Step 5: Solve for x
   x = 395,602,631,930.25/428,865
6. Step 6: Final answer
   x = 922,440.94