Finding the Fourth Proportional to 2,872.40, 4,304.54 and 1,308.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,872.40 : 4,304.54 = 1,308.56 : x
2. Step 2: Convert to fraction form
   2,872.40/4,304.54 = 1,308.56/x
3. Step 3: Cross multiply
   2,872.40x = 4,304.54 × 1,308.56
4. Step 4: Simplify right side
   2,872.40x = 5,632,730.61
5. Step 5: Solve for x
   x = 5,632,730.61/2,872.40
6. Step 6: Final answer
   x = 1,960.99