Finding the Third Proportional to 558 and 1,253.25

Step by Step Solution

1. Step 1: Write the proportion equation
   558 : 1,253.25 = 1,253.25 : x
2. Step 2: Convert to fraction form
   558/1,253.25 = 1,253.25/x
3. Step 3: Cross multiply
   558x = 1,253.25 × 1,253.25
4. Step 4: Simplify right side
   558x = 1,570,635.56
5. Step 5: Solve for x
   x = 1,570,635.56/558
6. Step 6: Final answer
   x = 2,814.76