Finding the Third Proportional to 428,920 and 630,892

Step by Step Solution

1. Step 1: Write the proportion equation
   428,920 : 630,892 = 630,892 : x
2. Step 2: Convert to fraction form
   428,920/630,892 = 630,892/x
3. Step 3: Cross multiply
   428,920x = 630,892 × 630,892
4. Step 4: Simplify right side
   428,920x = 398,024,715,664
5. Step 5: Solve for x
   x = 398,024,715,664/428,920
6. Step 6: Final answer
   x = 927,969.59