Finding the Fourth Proportional to 3,873.59, 5,345.47 and 2,105.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,873.59 : 5,345.47 = 2,105.15 : x
2. Step 2: Convert to fraction form
   3,873.59/5,345.47 = 2,105.15/x
3. Step 3: Cross multiply
   3,873.59x = 5,345.47 × 2,105.15
4. Step 4: Simplify right side
   3,873.59x = 11,253,016.17
5. Step 5: Solve for x
   x = 11,253,016.17/3,873.59
6. Step 6: Final answer
   x = 2,905.06