Finding the Third Proportional to 228,420 and 490,860

Step by Step Solution

1. Step 1: Write the proportion equation
   228,420 : 490,860 = 490,860 : x
2. Step 2: Convert to fraction form
   228,420/490,860 = 490,860/x
3. Step 3: Cross multiply
   228,420x = 490,860 × 490,860
4. Step 4: Simplify right side
   228,420x = 240,943,539,600
5. Step 5: Solve for x
   x = 240,943,539,600/228,420
6. Step 6: Final answer
   x = 1,054,826.81