Finding the Fourth Proportional to 2,185.85, 3,016.49 and 1,191.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.85 : 3,016.49 = 1,191.15 : x
2. Step 2: Convert to fraction form
   2,185.85/3,016.49 = 1,191.15/x
3. Step 3: Cross multiply
   2,185.85x = 3,016.49 × 1,191.15
4. Step 4: Simplify right side
   2,185.85x = 3,593,086.11
5. Step 5: Solve for x
   x = 3,593,086.11/2,185.85
6. Step 6: Final answer
   x = 1,643.80