Finding the Fourth Proportional to 2,386.30, 3,292.89 and 1,391.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.30 : 3,292.89 = 1,391.67 : x
2. Step 2: Convert to fraction form
   2,386.30/3,292.89 = 1,391.67/x
3. Step 3: Cross multiply
   2,386.30x = 3,292.89 × 1,391.67
4. Step 4: Simplify right side
   2,386.30x = 4,582,616.23
5. Step 5: Solve for x
   x = 4,582,616.23/2,386.30
6. Step 6: Final answer
   x = 1,920.39