Finding the Fourth Proportional to 3,855.30, 5,778.81 and 1,665.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.30 : 5,778.81 = 1,665.06 : x
2. Step 2: Convert to fraction form
   3,855.30/5,778.81 = 1,665.06/x
3. Step 3: Cross multiply
   3,855.30x = 5,778.81 × 1,665.06
4. Step 4: Simplify right side
   3,855.30x = 9,622,065.38
5. Step 5: Solve for x
   x = 9,622,065.38/3,855.30
6. Step 6: Final answer
   x = 2,495.80