Finding the Fourth Proportional to 2,105.55, 3,158.51 and 545.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.55 : 3,158.51 = 545.54 : x
2. Step 2: Convert to fraction form
   2,105.55/3,158.51 = 545.54/x
3. Step 3: Cross multiply
   2,105.55x = 3,158.51 × 545.54
4. Step 4: Simplify right side
   2,105.55x = 1,723,093.55
5. Step 5: Solve for x
   x = 1,723,093.55/2,105.55
6. Step 6: Final answer
   x = 818.36