Finding the Fourth Proportional to 2,105.57, 3,158.49 and 1,180.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.57 : 3,158.49 = 1,180.43 : x
2. Step 2: Convert to fraction form
   2,105.57/3,158.49 = 1,180.43/x
3. Step 3: Cross multiply
   2,105.57x = 3,158.49 × 1,180.43
4. Step 4: Simplify right side
   2,105.57x = 3,728,360.56
5. Step 5: Solve for x
   x = 3,728,360.56/2,105.57
6. Step 6: Final answer
   x = 1,770.72