Finding the Third Proportional to 3,321 and 5,209.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,321 : 5,209.31 = 5,209.31 : x
2. Step 2: Convert to fraction form
   3,321/5,209.31 = 5,209.31/x
3. Step 3: Cross multiply
   3,321x = 5,209.31 × 5,209.31
4. Step 4: Simplify right side
   3,321x = 27,136,936.72
5. Step 5: Solve for x
   x = 27,136,936.72/3,321
6. Step 6: Final answer
   x = 8,171.31