Finding the Fourth Proportional to 2,557.72, 3,828.33 and 1,323.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.72 : 3,828.33 = 1,323.43 : x
2. Step 2: Convert to fraction form
   2,557.72/3,828.33 = 1,323.43/x
3. Step 3: Cross multiply
   2,557.72x = 3,828.33 × 1,323.43
4. Step 4: Simplify right side
   2,557.72x = 5,066,526.77
5. Step 5: Solve for x
   x = 5,066,526.77/2,557.72
6. Step 6: Final answer
   x = 1,980.88