Finding the Fourth Proportional to 2,648.33, 3,969.84 and 1,328.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,648.33 : 3,969.84 = 1,328.04 : x
2. Step 2: Convert to fraction form
   2,648.33/3,969.84 = 1,328.04/x
3. Step 3: Cross multiply
   2,648.33x = 3,969.84 × 1,328.04
4. Step 4: Simplify right side
   2,648.33x = 5,272,106.31
5. Step 5: Solve for x
   x = 5,272,106.31/2,648.33
6. Step 6: Final answer
   x = 1,990.73