Finding the Fourth Proportional to 3,969.82, 5,478.48 and 2,291.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.82 : 5,478.48 = 2,291.31 : x
2. Step 2: Convert to fraction form
   3,969.82/5,478.48 = 2,291.31/x
3. Step 3: Cross multiply
   3,969.82x = 5,478.48 × 2,291.31
4. Step 4: Simplify right side
   3,969.82x = 12,552,896.01
5. Step 5: Solve for x
   x = 12,552,896.01/3,969.82
6. Step 6: Final answer
   x = 3,162.08