Finding the Fourth Proportional to 2,339.40, 3,507.60 and 1,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.40 : 3,507.60 = 1,105.20 : x
2. Step 2: Convert to fraction form
   2,339.40/3,507.60 = 1,105.20/x
3. Step 3: Cross multiply
   2,339.40x = 3,507.60 × 1,105.20
4. Step 4: Simplify right side
   2,339.40x = 3,876,599.52
5. Step 5: Solve for x
   x = 3,876,599.52/2,339.40
6. Step 6: Final answer
   x = 1,657.09