Finding the Fourth Proportional to 2,454.17, 3,386.57 and 1,391.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,454.17 : 3,386.57 = 1,391.96 : x
2. Step 2: Convert to fraction form
   2,454.17/3,386.57 = 1,391.96/x
3. Step 3: Cross multiply
   2,454.17x = 3,386.57 × 1,391.96
4. Step 4: Simplify right side
   2,454.17x = 4,713,969.98
5. Step 5: Solve for x
   x = 4,713,969.98/2,454.17
6. Step 6: Final answer
   x = 1,920.80