Finding the Fourth Proportional to 2,072.40, 2,859.91 and 1,128.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.40 : 2,859.91 = 1,128.18 : x
2. Step 2: Convert to fraction form
   2,072.40/2,859.91 = 1,128.18/x
3. Step 3: Cross multiply
   2,072.40x = 2,859.91 × 1,128.18
4. Step 4: Simplify right side
   2,072.40x = 3,226,479.72
5. Step 5: Solve for x
   x = 3,226,479.72/2,072.40
6. Step 6: Final answer
   x = 1,556.88