Finding the Fourth Proportional to 2,945.74, 4,419.20 and 865.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,945.74 : 4,419.20 = 865.81 : x
2. Step 2: Convert to fraction form
   2,945.74/4,419.20 = 865.81/x
3. Step 3: Cross multiply
   2,945.74x = 4,419.20 × 865.81
4. Step 4: Simplify right side
   2,945.74x = 3,826,187.55
5. Step 5: Solve for x
   x = 3,826,187.55/2,945.74
6. Step 6: Final answer
   x = 1,298.89