Finding the Fourth Proportional to 3,876.78, 5,787.05 and 3,587.68

Step by Step Solution

1. Step 1: Write the proportion equation
   3,876.78 : 5,787.05 = 3,587.68 : x
2. Step 2: Convert to fraction form
   3,876.78/5,787.05 = 3,587.68/x
3. Step 3: Cross multiply
   3,876.78x = 5,787.05 × 3,587.68
4. Step 4: Simplify right side
   3,876.78x = 20,762,083.54
5. Step 5: Solve for x
   x = 20,762,083.54/3,876.78
6. Step 6: Final answer
   x = 5,355.50