Finding the Third Proportional to 517.22 and 1,111.78

Step by Step Solution

1. Step 1: Write the proportion equation
   517.22 : 1,111.78 = 1,111.78 : x
2. Step 2: Convert to fraction form
   517.22/1,111.78 = 1,111.78/x
3. Step 3: Cross multiply
   517.22x = 1,111.78 × 1,111.78
4. Step 4: Simplify right side
   517.22x = 1,236,057.55
5. Step 5: Solve for x
   x = 1,236,057.55/517.22
6. Step 6: Final answer
   x = 2,389.82