Finding the Fourth Proportional to 2,553.71, 3,828.62 and 1,320.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,553.71 : 3,828.62 = 1,320.33 : x
2. Step 2: Convert to fraction form
   2,553.71/3,828.62 = 1,320.33/x
3. Step 3: Cross multiply
   2,553.71x = 3,828.62 × 1,320.33
4. Step 4: Simplify right side
   2,553.71x = 5,055,055.79
5. Step 5: Solve for x
   x = 5,055,055.79/2,553.71
6. Step 6: Final answer
   x = 1,979.49