Finding the Fourth Proportional to 2,185.86, 3,016.42 and 1,191.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.86 : 3,016.42 = 1,191.12 : x
2. Step 2: Convert to fraction form
   2,185.86/3,016.42 = 1,191.12/x
3. Step 3: Cross multiply
   2,185.86x = 3,016.42 × 1,191.12
4. Step 4: Simplify right side
   2,185.86x = 3,592,918.19
5. Step 5: Solve for x
   x = 3,592,918.19/2,185.86
6. Step 6: Final answer
   x = 1,643.71