Finding the Fourth Proportional to 1,908.31, 2,858.41 and 1,086.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,908.31 : 2,858.41 = 1,086.16 : x
2. Step 2: Convert to fraction form
   1,908.31/2,858.41 = 1,086.16/x
3. Step 3: Cross multiply
   1,908.31x = 2,858.41 × 1,086.16
4. Step 4: Simplify right side
   1,908.31x = 3,104,690.61
5. Step 5: Solve for x
   x = 3,104,690.61/1,908.31
6. Step 6: Final answer
   x = 1,626.93