Finding the Fourth Proportional to 2,105.54, 3,158.70 and 873.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.54 : 3,158.70 = 873.05 : x
2. Step 2: Convert to fraction form
   2,105.54/3,158.70 = 873.05/x
3. Step 3: Cross multiply
   2,105.54x = 3,158.70 × 873.05
4. Step 4: Simplify right side
   2,105.54x = 2,757,710.62
5. Step 5: Solve for x
   x = 2,757,710.62/2,105.54
6. Step 6: Final answer
   x = 1,309.74