Finding the Third Proportional to 558.38 and 1,222.88

Step by Step Solution

1. Step 1: Write the proportion equation
   558.38 : 1,222.88 = 1,222.88 : x
2. Step 2: Convert to fraction form
   558.38/1,222.88 = 1,222.88/x
3. Step 3: Cross multiply
   558.38x = 1,222.88 × 1,222.88
4. Step 4: Simplify right side
   558.38x = 1,495,423.27
5. Step 5: Solve for x
   x = 1,495,423.27/558.38
6. Step 6: Final answer
   x = 2,678.17