Finding the Fourth Proportional to 1,030.94, 1,544.61 and 858.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.94 : 1,544.61 = 858.72 : x
2. Step 2: Convert to fraction form
   1,030.94/1,544.61 = 858.72/x
3. Step 3: Cross multiply
   1,030.94x = 1,544.61 × 858.72
4. Step 4: Simplify right side
   1,030.94x = 1,326,387.50
5. Step 5: Solve for x
   x = 1,326,387.50/1,030.94
6. Step 6: Final answer
   x = 1,286.58