Finding the Third Proportional to 3,221.81 and 7,066.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,221.81 : 7,066.31 = 7,066.31 : x
2. Step 2: Convert to fraction form
   3,221.81/7,066.31 = 7,066.31/x
3. Step 3: Cross multiply
   3,221.81x = 7,066.31 × 7,066.31
4. Step 4: Simplify right side
   3,221.81x = 49,932,772.35
5. Step 5: Solve for x
   x = 49,932,772.35/3,221.81
6. Step 6: Final answer
   x = 15,498.35