Finding the Third Proportional to 428,859 and 630,814.50

Step by Step Solution

1. Step 1: Write the proportion equation
   428,859 : 630,814.50 = 630,814.50 : x
2. Step 2: Convert to fraction form
   428,859/630,814.50 = 630,814.50/x
3. Step 3: Cross multiply
   428,859x = 630,814.50 × 630,814.50
4. Step 4: Simplify right side
   428,859x = 397,926,933,410.25
5. Step 5: Solve for x
   x = 397,926,933,410.25/428,859
6. Step 6: Final answer
   x = 927,873.57