Finding the Third Proportional to 251,996 and 389,900

Step by Step Solution

1. Step 1: Write the proportion equation
   251,996 : 389,900 = 389,900 : x
2. Step 2: Convert to fraction form
   251,996/389,900 = 389,900/x
3. Step 3: Cross multiply
   251,996x = 389,900 × 389,900
4. Step 4: Simplify right side
   251,996x = 152,022,010,000
5. Step 5: Solve for x
   x = 152,022,010,000/251,996
6. Step 6: Final answer
   x = 603,271.52