Finding the Fourth Proportional to 2,186.70, 3,017.65 and 1,191.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.70 : 3,017.65 = 1,191.98 : x
2. Step 2: Convert to fraction form
   2,186.70/3,017.65 = 1,191.98/x
3. Step 3: Cross multiply
   2,186.70x = 3,017.65 × 1,191.98
4. Step 4: Simplify right side
   2,186.70x = 3,596,983.01
5. Step 5: Solve for x
   x = 3,596,983.01/2,186.70
6. Step 6: Final answer
   x = 1,644.94