Finding the Fourth Proportional to 2,186.43, 3,017.30 and 1,191.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,186.43 : 3,017.30 = 1,191.72 : x
2. Step 2: Convert to fraction form
   2,186.43/3,017.30 = 1,191.72/x
3. Step 3: Cross multiply
   2,186.43x = 3,017.30 × 1,191.72
4. Step 4: Simplify right side
   2,186.43x = 3,595,776.76
5. Step 5: Solve for x
   x = 3,595,776.76/2,186.43
6. Step 6: Final answer
   x = 1,644.59