Finding the Fourth Proportional to 2,858.58, 4,289.31 and 1,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.58 : 4,289.31 = 1,128.42 : x
2. Step 2: Convert to fraction form
   2,858.58/4,289.31 = 1,128.42/x
3. Step 3: Cross multiply
   2,858.58x = 4,289.31 × 1,128.42
4. Step 4: Simplify right side
   2,858.58x = 4,840,143.19
5. Step 5: Solve for x
   x = 4,840,143.19/2,858.58
6. Step 6: Final answer
   x = 1,693.20