Finding the Fourth Proportional to 1,608.87, 2,218.82 and 1,085.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,608.87 : 2,218.82 = 1,085.61 : x
2. Step 2: Convert to fraction form
   1,608.87/2,218.82 = 1,085.61/x
3. Step 3: Cross multiply
   1,608.87x = 2,218.82 × 1,085.61
4. Step 4: Simplify right side
   1,608.87x = 2,408,767.75
5. Step 5: Solve for x
   x = 2,408,767.75/1,608.87
6. Step 6: Final answer
   x = 1,497.18