Finding the Fourth Proportional to 2,311.19, 3,185.69 and 1,806.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,311.19 : 3,185.69 = 1,806.16 : x
2. Step 2: Convert to fraction form
   2,311.19/3,185.69 = 1,806.16/x
3. Step 3: Cross multiply
   2,311.19x = 3,185.69 × 1,806.16
4. Step 4: Simplify right side
   2,311.19x = 5,753,862.40
5. Step 5: Solve for x
   x = 5,753,862.40/2,311.19
6. Step 6: Final answer
   x = 2,489.56