Finding the Third Proportional to 518.25 and 1,139

Step by Step Solution

1. Step 1: Write the proportion equation
   518.25 : 1,139 = 1,139 : x
2. Step 2: Convert to fraction form
   518.25/1,139 = 1,139/x
3. Step 3: Cross multiply
   518.25x = 1,139 × 1,139
4. Step 4: Simplify right side
   518.25x = 1,297,321
5. Step 5: Solve for x
   x = 1,297,321/518.25
6. Step 6: Final answer
   x = 2,503.27