Finding the Fourth Proportional to 2,860.86, 4,290.42 and 1,105.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.86 : 4,290.42 = 1,105.74 : x
2. Step 2: Convert to fraction form
   2,860.86/4,290.42 = 1,105.74/x
3. Step 3: Cross multiply
   2,860.86x = 4,290.42 × 1,105.74
4. Step 4: Simplify right side
   2,860.86x = 4,744,089.01
5. Step 5: Solve for x
   x = 4,744,089.01/2,860.86
6. Step 6: Final answer
   x = 1,658.27