Finding the Fourth Proportional to 2,181.20, 3,270.72 and 1,086.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,181.20 : 3,270.72 = 1,086.18 : x
2. Step 2: Convert to fraction form
   2,181.20/3,270.72 = 1,086.18/x
3. Step 3: Cross multiply
   2,181.20x = 3,270.72 × 1,086.18
4. Step 4: Simplify right side
   2,181.20x = 3,552,590.65
5. Step 5: Solve for x
   x = 3,552,590.65/2,181.20
6. Step 6: Final answer
   x = 1,628.74