Finding the Fourth Proportional to 3,880.18, 5,787.71 and 3,561.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880.18 : 5,787.71 = 3,561.76 : x
2. Step 2: Convert to fraction form
   3,880.18/5,787.71 = 3,561.76/x
3. Step 3: Cross multiply
   3,880.18x = 5,787.71 × 3,561.76
4. Step 4: Simplify right side
   3,880.18x = 20,614,433.97
5. Step 5: Solve for x
   x = 20,614,433.97/3,880.18
6. Step 6: Final answer
   x = 5,312.75