Finding the Fourth Proportional to 2,805.72, 3,877.92 and 2,105.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,805.72 : 3,877.92 = 2,105.88 : x
2. Step 2: Convert to fraction form
   2,805.72/3,877.92 = 2,105.88/x
3. Step 3: Cross multiply
   2,805.72x = 3,877.92 × 2,105.88
4. Step 4: Simplify right side
   2,805.72x = 8,166,434.17
5. Step 5: Solve for x
   x = 8,166,434.17/2,805.72
6. Step 6: Final answer
   x = 2,910.64