Finding the Third Proportional to 428,892 and 630,858

Step by Step Solution

1. Step 1: Write the proportion equation
   428,892 : 630,858 = 630,858 : x
2. Step 2: Convert to fraction form
   428,892/630,858 = 630,858/x
3. Step 3: Cross multiply
   428,892x = 630,858 × 630,858
4. Step 4: Simplify right side
   428,892x = 397,981,816,164
5. Step 5: Solve for x
   x = 397,981,816,164/428,892
6. Step 6: Final answer
   x = 927,930.15