Finding the Fourth Proportional to 3,418.05, 5,128.26 and 1,078.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,418.05 : 5,128.26 = 1,078.41 : x
2. Step 2: Convert to fraction form
   3,418.05/5,128.26 = 1,078.41/x
3. Step 3: Cross multiply
   3,418.05x = 5,128.26 × 1,078.41
4. Step 4: Simplify right side
   3,418.05x = 5,530,388.12
5. Step 5: Solve for x
   x = 5,530,388.12/3,418.05
6. Step 6: Final answer
   x = 1,618.00