Finding the Fourth Proportional to 2,557.95, 3,839.40 and 1,326.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.95 : 3,839.40 = 1,326.21 : x
2. Step 2: Convert to fraction form
   2,557.95/3,839.40 = 1,326.21/x
3. Step 3: Cross multiply
   2,557.95x = 3,839.40 × 1,326.21
4. Step 4: Simplify right side
   2,557.95x = 5,091,850.67
5. Step 5: Solve for x
   x = 5,091,850.67/2,557.95
6. Step 6: Final answer
   x = 1,990.60