Finding the Fourth Proportional to 2,669.78, 3,978.46 and 2,581.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,669.78 : 3,978.46 = 2,581.58 : x
2. Step 2: Convert to fraction form
   2,669.78/3,978.46 = 2,581.58/x
3. Step 3: Cross multiply
   2,669.78x = 3,978.46 × 2,581.58
4. Step 4: Simplify right side
   2,669.78x = 10,270,712.77
5. Step 5: Solve for x
   x = 10,270,712.77/2,669.78
6. Step 6: Final answer
   x = 3,847.03