Finding the Third Proportional to 2,645.72 and 5,709.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,645.72 : 5,709.09 = 5,709.09 : x
2. Step 2: Convert to fraction form
   2,645.72/5,709.09 = 5,709.09/x
3. Step 3: Cross multiply
   2,645.72x = 5,709.09 × 5,709.09
4. Step 4: Simplify right side
   2,645.72x = 32,593,751.45
5. Step 5: Solve for x
   x = 32,593,751.45/2,645.72
6. Step 6: Final answer
   x = 12,319.43