Finding the Fourth Proportional to 8,327.05, 12,489.43 and 2,780.27

Step by Step Solution

1. Step 1: Write the proportion equation
   8,327.05 : 12,489.43 = 2,780.27 : x
2. Step 2: Convert to fraction form
   8,327.05/12,489.43 = 2,780.27/x
3. Step 3: Cross multiply
   8,327.05x = 12,489.43 × 2,780.27
4. Step 4: Simplify right side
   8,327.05x = 34,723,987.55
5. Step 5: Solve for x
   x = 34,723,987.55/8,327.05
6. Step 6: Final answer
   x = 4,170.02