Finding the Fourth Proportional to 3,389.79, 5,083.61 and 1,080.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,389.79 : 5,083.61 = 1,080.75 : x
2. Step 2: Convert to fraction form
   3,389.79/5,083.61 = 1,080.75/x
3. Step 3: Cross multiply
   3,389.79x = 5,083.61 × 1,080.75
4. Step 4: Simplify right side
   3,389.79x = 5,494,106.10
5. Step 5: Solve for x
   x = 5,494,106.10/3,389.79
6. Step 6: Final answer
   x = 1,620.78