Finding the Fourth Proportional to 8,394.91, 12,581.43 and 5,231.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,394.91 : 12,581.43 = 5,231.05 : x
2. Step 2: Convert to fraction form
   8,394.91/12,581.43 = 5,231.05/x
3. Step 3: Cross multiply
   8,394.91x = 12,581.43 × 5,231.05
4. Step 4: Simplify right side
   8,394.91x = 65,814,038.33
5. Step 5: Solve for x
   x = 65,814,038.33/8,394.91
6. Step 6: Final answer
   x = 7,839.76