Finding the Fourth Proportional to 2,205.78, 3,043.98 and 1,211.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,205.78 : 3,043.98 = 1,211.07 : x
2. Step 2: Convert to fraction form
   2,205.78/3,043.98 = 1,211.07/x
3. Step 3: Cross multiply
   2,205.78x = 3,043.98 × 1,211.07
4. Step 4: Simplify right side
   2,205.78x = 3,686,472.86
5. Step 5: Solve for x
   x = 3,686,472.86/2,205.78
6. Step 6: Final answer
   x = 1,671.28