Finding the Third Proportional to 2,117.81 and 3,198.66

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.81 : 3,198.66 = 3,198.66 : x
2. Step 2: Convert to fraction form
   2,117.81/3,198.66 = 3,198.66/x
3. Step 3: Cross multiply
   2,117.81x = 3,198.66 × 3,198.66
4. Step 4: Simplify right side
   2,117.81x = 10,231,401.81
5. Step 5: Solve for x
   x = 10,231,401.81/2,117.81
6. Step 6: Final answer
   x = 4,831.12