Finding the Fourth Proportional to 2,391.38, 3,300.18 and 1,329.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,391.38 : 3,300.18 = 1,329.20 : x
2. Step 2: Convert to fraction form
   2,391.38/3,300.18 = 1,329.20/x
3. Step 3: Cross multiply
   2,391.38x = 3,300.18 × 1,329.20
4. Step 4: Simplify right side
   2,391.38x = 4,386,599.26
5. Step 5: Solve for x
   x = 4,386,599.26/2,391.38
6. Step 6: Final answer
   x = 1,834.34