Finding the Fourth Proportional to 3,912.12, 5,398.56 and 2,340.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,912.12 : 5,398.56 = 2,340.72 : x
2. Step 2: Convert to fraction form
   3,912.12/5,398.56 = 2,340.72/x
3. Step 3: Cross multiply
   3,912.12x = 5,398.56 × 2,340.72
4. Step 4: Simplify right side
   3,912.12x = 12,636,517.36
5. Step 5: Solve for x
   x = 12,636,517.36/3,912.12
6. Step 6: Final answer
   x = 3,230.09