Finding the Third Proportional to 2,117.81 and 3,218.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.81 : 3,218.91 = 3,218.91 : x
2. Step 2: Convert to fraction form
   2,117.81/3,218.91 = 3,218.91/x
3. Step 3: Cross multiply
   2,117.81x = 3,218.91 × 3,218.91
4. Step 4: Simplify right side
   2,117.81x = 10,361,357.45
5. Step 5: Solve for x
   x = 10,361,357.45/2,117.81
6. Step 6: Final answer
   x = 4,892.48