Finding the Third Proportional to 428,862.50 and 630,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,862.50 : 630,819.50 = 630,819.50 : x
2. Step 2: Convert to fraction form
   428,862.50/630,819.50 = 630,819.50/x
3. Step 3: Cross multiply
   428,862.50x = 630,819.50 × 630,819.50
4. Step 4: Simplify right side
   428,862.50x = 397,933,241,580.25
5. Step 5: Solve for x
   x = 397,933,241,580.25/428,862.50
6. Step 6: Final answer
   x = 927,880.71