Finding the Third Proportional to 428,691 and 630,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,691 : 630,643.50 = 630,643.50 : x
2. Step 2: Convert to fraction form
   428,691/630,643.50 = 630,643.50/x
3. Step 3: Cross multiply
   428,691x = 630,643.50 × 630,643.50
4. Step 4: Simplify right side
   428,691x = 397,711,224,092.25
5. Step 5: Solve for x
   x = 397,711,224,092.25/428,691
6. Step 6: Final answer
   x = 927,734.02