Finding the Fourth Proportional to 2,858.29, 4,289.86 and 1,128.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,858.29 : 4,289.86 = 1,128.13 : x
2. Step 2: Convert to fraction form
   2,858.29/4,289.86 = 1,128.13/x
3. Step 3: Cross multiply
   2,858.29x = 4,289.86 × 1,128.13
4. Step 4: Simplify right side
   2,858.29x = 4,839,519.76
5. Step 5: Solve for x
   x = 4,839,519.76/2,858.29
6. Step 6: Final answer
   x = 1,693.15