Finding the Fourth Proportional to 2,390.88, 3,299.46 and 1,328.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.88 : 3,299.46 = 1,328.70 : x
2. Step 2: Convert to fraction form
   2,390.88/3,299.46 = 1,328.70/x
3. Step 3: Cross multiply
   2,390.88x = 3,299.46 × 1,328.70
4. Step 4: Simplify right side
   2,390.88x = 4,383,992.50
5. Step 5: Solve for x
   x = 4,383,992.50/2,390.88
6. Step 6: Final answer
   x = 1,833.63