Finding the Third Proportional to 356,644 and 554,012

Step by Step Solution

1. Step 1: Write the proportion equation
   356,644 : 554,012 = 554,012 : x
2. Step 2: Convert to fraction form
   356,644/554,012 = 554,012/x
3. Step 3: Cross multiply
   356,644x = 554,012 × 554,012
4. Step 4: Simplify right side
   356,644x = 306,929,296,144
5. Step 5: Solve for x
   x = 306,929,296,144/356,644
6. Step 6: Final answer
   x = 860,604.12