Finding the Fourth Proportional to 3,427.78, 5,142.60 and 1,119.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,427.78 : 5,142.60 = 1,119.28 : x
2. Step 2: Convert to fraction form
   3,427.78/5,142.60 = 1,119.28/x
3. Step 3: Cross multiply
   3,427.78x = 5,142.60 × 1,119.28
4. Step 4: Simplify right side
   3,427.78x = 5,756,009.33
5. Step 5: Solve for x
   x = 5,756,009.33/3,427.78
6. Step 6: Final answer
   x = 1,679.22