Finding the Third Proportional to 3,519.81 and 7,717.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,519.81 : 7,717.31 = 7,717.31 : x
2. Step 2: Convert to fraction form
   3,519.81/7,717.31 = 7,717.31/x
3. Step 3: Cross multiply
   3,519.81x = 7,717.31 × 7,717.31
4. Step 4: Simplify right side
   3,519.81x = 59,556,912.22
5. Step 5: Solve for x
   x = 59,556,912.22/3,519.81
6. Step 6: Final answer
   x = 16,920.48