Finding the Fourth Proportional to 2,859.58, 4,286.90 and 1,105.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,859.58 : 4,286.90 = 1,105.81 : x
2. Step 2: Convert to fraction form
   2,859.58/4,286.90 = 1,105.81/x
3. Step 3: Cross multiply
   2,859.58x = 4,286.90 × 1,105.81
4. Step 4: Simplify right side
   2,859.58x = 4,740,496.89
5. Step 5: Solve for x
   x = 4,740,496.89/2,859.58
6. Step 6: Final answer
   x = 1,657.76