Finding the Fourth Proportional to 2,382.38, 3,287.60 and 1,320.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,382.38 : 3,287.60 = 1,320.10 : x
2. Step 2: Convert to fraction form
   2,382.38/3,287.60 = 1,320.10/x
3. Step 3: Cross multiply
   2,382.38x = 3,287.60 × 1,320.10
4. Step 4: Simplify right side
   2,382.38x = 4,339,950.89
5. Step 5: Solve for x
   x = 4,339,950.89/2,382.38
6. Step 6: Final answer
   x = 1,821.69