Finding the Fourth Proportional to 3,419.15, 5,126.81 and 1,078.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,419.15 : 5,126.81 = 1,078.72 : x
2. Step 2: Convert to fraction form
   3,419.15/5,126.81 = 1,078.72/x
3. Step 3: Cross multiply
   3,419.15x = 5,126.81 × 1,078.72
4. Step 4: Simplify right side
   3,419.15x = 5,530,392.01
5. Step 5: Solve for x
   x = 5,530,392.01/3,419.15
6. Step 6: Final answer
   x = 1,617.47