Finding the Fourth Proportional to 2,553.85, 3,828.83 and 1,320.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,553.85 : 3,828.83 = 1,320.47 : x
2. Step 2: Convert to fraction form
   2,553.85/3,828.83 = 1,320.47/x
3. Step 3: Cross multiply
   2,553.85x = 3,828.83 × 1,320.47
4. Step 4: Simplify right side
   2,553.85x = 5,055,872.73
5. Step 5: Solve for x
   x = 5,055,872.73/2,553.85
6. Step 6: Final answer
   x = 1,979.71