Finding the Fourth Proportional to 2,205.81, 3,043.89 and 1,321.65

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205.81 : 3,043.89 = 1,321.65 : x
2. Step 2: Convert to fraction form
   2,205.81/3,043.89 = 1,321.65/x
3. Step 3: Cross multiply
   2,205.81x = 3,043.89 × 1,321.65
4. Step 4: Simplify right side
   2,205.81x = 4,022,957.22
5. Step 5: Solve for x
   x = 4,022,957.22/2,205.81
6. Step 6: Final answer
   x = 1,823.80