Finding the Fourth Proportional to 3,873.65, 5,345.59 and 2,105.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,873.65 : 5,345.59 = 2,105.15 : x
2. Step 2: Convert to fraction form
   3,873.65/5,345.59 = 2,105.15/x
3. Step 3: Cross multiply
   3,873.65x = 5,345.59 × 2,105.15
4. Step 4: Simplify right side
   3,873.65x = 11,253,268.79
5. Step 5: Solve for x
   x = 11,253,268.79/3,873.65
6. Step 6: Final answer
   x = 2,905.08