Finding the Fourth Proportional to 1,488.89, 2,054.19 and 859.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.89 : 2,054.19 = 859.33 : x
2. Step 2: Convert to fraction form
   1,488.89/2,054.19 = 859.33/x
3. Step 3: Cross multiply
   1,488.89x = 2,054.19 × 859.33
4. Step 4: Simplify right side
   1,488.89x = 1,765,227.09
5. Step 5: Solve for x
   x = 1,765,227.09/1,488.89
6. Step 6: Final answer
   x = 1,185.60