Finding the Fourth Proportional to 2,386.18, 3,292.72 and 1,391.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.18 : 3,292.72 = 1,391.55 : x
2. Step 2: Convert to fraction form
   2,386.18/3,292.72 = 1,391.55/x
3. Step 3: Cross multiply
   2,386.18x = 3,292.72 × 1,391.55
4. Step 4: Simplify right side
   2,386.18x = 4,581,968.69
5. Step 5: Solve for x
   x = 4,581,968.69/2,386.18
6. Step 6: Final answer
   x = 1,920.21