Finding the Fourth Proportional to 3,699.05, 5,104.23 and 2,105.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,699.05 : 5,104.23 = 2,105.91 : x
2. Step 2: Convert to fraction form
   3,699.05/5,104.23 = 2,105.91/x
3. Step 3: Cross multiply
   3,699.05x = 5,104.23 × 2,105.91
4. Step 4: Simplify right side
   3,699.05x = 10,749,023.48
5. Step 5: Solve for x
   x = 10,749,023.48/3,699.05
6. Step 6: Final answer
   x = 2,905.89