Finding the Fourth Proportional to 3,900.54, 5,382.92 and 2,407.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,900.54 : 5,382.92 = 2,407.31 : x
2. Step 2: Convert to fraction form
   3,900.54/5,382.92 = 2,407.31/x
3. Step 3: Cross multiply
   3,900.54x = 5,382.92 × 2,407.31
4. Step 4: Simplify right side
   3,900.54x = 12,958,357.15
5. Step 5: Solve for x
   x = 12,958,357.15/3,900.54
6. Step 6: Final answer
   x = 3,322.20