Finding the Third Proportional to 2,618.81 and 5,708.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.81 : 5,708.31 = 5,708.31 : x
2. Step 2: Convert to fraction form
   2,618.81/5,708.31 = 5,708.31/x
3. Step 3: Cross multiply
   2,618.81x = 5,708.31 × 5,708.31
4. Step 4: Simplify right side
   2,618.81x = 32,584,831.60
5. Step 5: Solve for x
   x = 32,584,831.60/2,618.81
6. Step 6: Final answer
   x = 12,442.60