Finding the Fourth Proportional to 3,419.25, 5,128.98 and 1,079.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,419.25 : 5,128.98 = 1,079.28 : x
2. Step 2: Convert to fraction form
   3,419.25/5,128.98 = 1,079.28/x
3. Step 3: Cross multiply
   3,419.25x = 5,128.98 × 1,079.28
4. Step 4: Simplify right side
   3,419.25x = 5,535,605.53
5. Step 5: Solve for x
   x = 5,535,605.53/3,419.25
6. Step 6: Final answer
   x = 1,618.95