Finding the Third Proportional to 223.45 and 490.15

Step by Step Solution

1. Step 1: Write the proportion equation
   223.45 : 490.15 = 490.15 : x
2. Step 2: Convert to fraction form
   223.45/490.15 = 490.15/x
3. Step 3: Cross multiply
   223.45x = 490.15 × 490.15
4. Step 4: Simplify right side
   223.45x = 240,249.80
5. Step 5: Solve for x
   x = 240,249.80/223.45
6. Step 6: Final answer
   x = 1,075.17