Finding the Third Proportional to 406,948 and 630,870

Step by Step Solution

1. Step 1: Write the proportion equation
   406,948 : 630,870 = 630,870 : x
2. Step 2: Convert to fraction form
   406,948/630,870 = 630,870/x
3. Step 3: Cross multiply
   406,948x = 630,870 × 630,870
4. Step 4: Simplify right side
   406,948x = 397,996,956,900
5. Step 5: Solve for x
   x = 397,996,956,900/406,948
6. Step 6: Final answer
   x = 978,004.45