Finding the Third Proportional to 428,866.50 and 630,826.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,866.50 : 630,826.50 = 630,826.50 : x
2. Step 2: Convert to fraction form
   428,866.50/630,826.50 = 630,826.50/x
3. Step 3: Cross multiply
   428,866.50x = 630,826.50 × 630,826.50
4. Step 4: Simplify right side
   428,866.50x = 397,942,073,102.25
5. Step 5: Solve for x
   x = 397,942,073,102.25/428,866.50
6. Step 6: Final answer
   x = 927,892.65