Finding the Fourth Proportional to 1,488.73, 2,054.45 and 859.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.73 : 2,054.45 = 859.28 : x
2. Step 2: Convert to fraction form
   1,488.73/2,054.45 = 859.28/x
3. Step 3: Cross multiply
   1,488.73x = 2,054.45 × 859.28
4. Step 4: Simplify right side
   1,488.73x = 1,765,345.76
5. Step 5: Solve for x
   x = 1,765,345.76/1,488.73
6. Step 6: Final answer
   x = 1,185.81