Finding the Fourth Proportional to 2,554.56, 3,828.60 and 1,321.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,554.56 : 3,828.60 = 1,321.74 : x
2. Step 2: Convert to fraction form
   2,554.56/3,828.60 = 1,321.74/x
3. Step 3: Cross multiply
   2,554.56x = 3,828.60 × 1,321.74
4. Step 4: Simplify right side
   2,554.56x = 5,060,413.76
5. Step 5: Solve for x
   x = 5,060,413.76/2,554.56
6. Step 6: Final answer
   x = 1,980.93