Finding the Fourth Proportional to 1,058.58, 1,585.71 and 544.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.58 : 1,585.71 = 544.50 : x
2. Step 2: Convert to fraction form
   1,058.58/1,585.71 = 544.50/x
3. Step 3: Cross multiply
   1,058.58x = 1,585.71 × 544.50
4. Step 4: Simplify right side
   1,058.58x = 863,419.10
5. Step 5: Solve for x
   x = 863,419.10/1,058.58
6. Step 6: Final answer
   x = 815.64