Finding the Third Proportional to 428,916 and 630,886

Step by Step Solution

1. Step 1: Write the proportion equation
   428,916 : 630,886 = 630,886 : x
2. Step 2: Convert to fraction form
   428,916/630,886 = 630,886/x
3. Step 3: Cross multiply
   428,916x = 630,886 × 630,886
4. Step 4: Simplify right side
   428,916x = 398,017,144,996
5. Step 5: Solve for x
   x = 398,017,144,996/428,916
6. Step 6: Final answer
   x = 927,960.59