Finding the Fourth Proportional to 2,386.43, 3,294.03 and 1,391.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.43 : 3,294.03 = 1,391.89 : x
2. Step 2: Convert to fraction form
   2,386.43/3,294.03 = 1,391.89/x
3. Step 3: Cross multiply
   2,386.43x = 3,294.03 × 1,391.89
4. Step 4: Simplify right side
   2,386.43x = 4,584,928.10
5. Step 5: Solve for x
   x = 4,584,928.10/2,386.43
6. Step 6: Final answer
   x = 1,921.25