Finding the Fourth Proportional to 2,748.80, 4,123.39 and 1,105.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,748.80 : 4,123.39 = 1,105.35 : x
2. Step 2: Convert to fraction form
   2,748.80/4,123.39 = 1,105.35/x
3. Step 3: Cross multiply
   2,748.80x = 4,123.39 × 1,105.35
4. Step 4: Simplify right side
   2,748.80x = 4,557,786.37
5. Step 5: Solve for x
   x = 4,557,786.37/2,748.80
6. Step 6: Final answer
   x = 1,658.10