Finding the Fourth Proportional to 3,873.99, 5,345.89 and 2,105.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,873.99 : 5,345.89 = 2,105.59 : x
2. Step 2: Convert to fraction form
   3,873.99/5,345.89 = 2,105.59/x
3. Step 3: Cross multiply
   3,873.99x = 5,345.89 × 2,105.59
4. Step 4: Simplify right side
   3,873.99x = 11,256,215.27
5. Step 5: Solve for x
   x = 11,256,215.27/3,873.99
6. Step 6: Final answer
   x = 2,905.59