Finding the Fourth Proportional to 3,920.94, 5,411.01 and 2,219.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.94 : 5,411.01 = 2,219.31 : x
2. Step 2: Convert to fraction form
   3,920.94/5,411.01 = 2,219.31/x
3. Step 3: Cross multiply
   3,920.94x = 5,411.01 × 2,219.31
4. Step 4: Simplify right side
   3,920.94x = 12,008,708.60
5. Step 5: Solve for x
   x = 12,008,708.60/3,920.94
6. Step 6: Final answer
   x = 3,062.71