Finding the Fourth Proportional to 2,386.17, 3,292.61 and 1,391.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.17 : 3,292.61 = 1,391.20 : x
2. Step 2: Convert to fraction form
   2,386.17/3,292.61 = 1,391.20/x
3. Step 3: Cross multiply
   2,386.17x = 3,292.61 × 1,391.20
4. Step 4: Simplify right side
   2,386.17x = 4,580,679.03
5. Step 5: Solve for x
   x = 4,580,679.03/2,386.17
6. Step 6: Final answer
   x = 1,919.68