Finding the Fourth Proportional to 8,494.71, 12,739.89 and 2,648.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,494.71 : 12,739.89 = 2,648.31 : x
2. Step 2: Convert to fraction form
   8,494.71/12,739.89 = 2,648.31/x
3. Step 3: Cross multiply
   8,494.71x = 12,739.89 × 2,648.31
4. Step 4: Simplify right side
   8,494.71x = 33,739,178.09
5. Step 5: Solve for x
   x = 33,739,178.09/8,494.71
6. Step 6: Final answer
   x = 3,971.79