Finding the Fourth Proportional to 2,205.52, 3,042.82 and 1,321.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205.52 : 3,042.82 = 1,321.20 : x
2. Step 2: Convert to fraction form
   2,205.52/3,042.82 = 1,321.20/x
3. Step 3: Cross multiply
   2,205.52x = 3,042.82 × 1,321.20
4. Step 4: Simplify right side
   2,205.52x = 4,020,173.78
5. Step 5: Solve for x
   x = 4,020,173.78/2,205.52
6. Step 6: Final answer
   x = 1,822.78