Finding the Fourth Proportional to 2,186.69, 3,017.61 and 1,191.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.69 : 3,017.61 = 1,191.96 : x
2. Step 2: Convert to fraction form
   2,186.69/3,017.61 = 1,191.96/x
3. Step 3: Cross multiply
   2,186.69x = 3,017.61 × 1,191.96
4. Step 4: Simplify right side
   2,186.69x = 3,596,870.42
5. Step 5: Solve for x
   x = 3,596,870.42/2,186.69
6. Step 6: Final answer
   x = 1,644.90