Finding the Fourth Proportional to 2,561.49, 3,843.32 and 1,329.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.49 : 3,843.32 = 1,329.21 : x
2. Step 2: Convert to fraction form
   2,561.49/3,843.32 = 1,329.21/x
3. Step 3: Cross multiply
   2,561.49x = 3,843.32 × 1,329.21
4. Step 4: Simplify right side
   2,561.49x = 5,108,572.73
5. Step 5: Solve for x
   x = 5,108,572.73/2,561.49
6. Step 6: Final answer
   x = 1,994.38