Finding the Fourth Proportional to 3,411.57, 5,116.59 and 1,330.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,411.57 : 5,116.59 = 1,330.86 : x
2. Step 2: Convert to fraction form
   3,411.57/5,116.59 = 1,330.86/x
3. Step 3: Cross multiply
   3,411.57x = 5,116.59 × 1,330.86
4. Step 4: Simplify right side
   3,411.57x = 6,809,464.97
5. Step 5: Solve for x
   x = 6,809,464.97/3,411.57
6. Step 6: Final answer
   x = 1,995.99