Finding the Third Proportional to 278,978 and 572,644

Step by Step Solution

1. Step 1: Write the proportion equation
   278,978 : 572,644 = 572,644 : x
2. Step 2: Convert to fraction form
   278,978/572,644 = 572,644/x
3. Step 3: Cross multiply
   278,978x = 572,644 × 572,644
4. Step 4: Simplify right side
   278,978x = 327,921,150,736
5. Step 5: Solve for x
   x = 327,921,150,736/278,978
6. Step 6: Final answer
   x = 1,175,437.31