Finding the Fourth Proportional to 2,105.60, 3,158.46 and 1,865.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.60 : 3,158.46 = 1,865.12 : x
2. Step 2: Convert to fraction form
   2,105.60/3,158.46 = 1,865.12/x
3. Step 3: Cross multiply
   2,105.60x = 3,158.46 × 1,865.12
4. Step 4: Simplify right side
   2,105.60x = 5,890,906.92
5. Step 5: Solve for x
   x = 5,890,906.92/2,105.60
6. Step 6: Final answer
   x = 2,797.73