Finding the Fourth Proportional to 2,385.81, 3,292.81 and 1,391.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,385.81 : 3,292.81 = 1,391.67 : x
2. Step 2: Convert to fraction form
   2,385.81/3,292.81 = 1,391.67/x
3. Step 3: Cross multiply
   2,385.81x = 3,292.81 × 1,391.67
4. Step 4: Simplify right side
   2,385.81x = 4,582,504.89
5. Step 5: Solve for x
   x = 4,582,504.89/2,385.81
6. Step 6: Final answer
   x = 1,920.73