Finding the Fourth Proportional to 2,405.69, 3,604.09 and 1,665.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.69 : 3,604.09 = 1,665.35 : x
2. Step 2: Convert to fraction form
   2,405.69/3,604.09 = 1,665.35/x
3. Step 3: Cross multiply
   2,405.69x = 3,604.09 × 1,665.35
4. Step 4: Simplify right side
   2,405.69x = 6,002,071.28
5. Step 5: Solve for x
   x = 6,002,071.28/2,405.69
6. Step 6: Final answer
   x = 2,494.95