Finding the Fourth Proportional to 2,054.40, 3,075.52 and 1,321.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,054.40 : 3,075.52 = 1,321.80 : x
2. Step 2: Convert to fraction form
   2,054.40/3,075.52 = 1,321.80/x
3. Step 3: Cross multiply
   2,054.40x = 3,075.52 × 1,321.80
4. Step 4: Simplify right side
   2,054.40x = 4,065,222.34
5. Step 5: Solve for x
   x = 4,065,222.34/2,054.40
6. Step 6: Final answer
   x = 1,978.79