Finding the Fourth Proportional to 3,418.53, 5,128.47 and 1,078.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,418.53 : 5,128.47 = 1,078.89 : x
2. Step 2: Convert to fraction form
   3,418.53/5,128.47 = 1,078.89/x
3. Step 3: Cross multiply
   3,418.53x = 5,128.47 × 1,078.89
4. Step 4: Simplify right side
   3,418.53x = 5,533,055.00
5. Step 5: Solve for x
   x = 5,533,055.00/3,418.53
6. Step 6: Final answer
   x = 1,618.55