Finding the Fourth Proportional to 3,940.76, 5,913.18 and 2,553.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,940.76 : 5,913.18 = 2,553.72 : x
2. Step 2: Convert to fraction form
   3,940.76/5,913.18 = 2,553.72/x
3. Step 3: Cross multiply
   3,940.76x = 5,913.18 × 2,553.72
4. Step 4: Simplify right side
   3,940.76x = 15,100,606.03
5. Step 5: Solve for x
   x = 15,100,606.03/3,940.76
6. Step 6: Final answer
   x = 3,831.91