Finding the Fourth Proportional to 1,058.55, 1,587.69 and 712.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.55 : 1,587.69 = 712.05 : x
2. Step 2: Convert to fraction form
   1,058.55/1,587.69 = 712.05/x
3. Step 3: Cross multiply
   1,058.55x = 1,587.69 × 712.05
4. Step 4: Simplify right side
   1,058.55x = 1,130,514.66
5. Step 5: Solve for x
   x = 1,130,514.66/1,058.55
6. Step 6: Final answer
   x = 1,067.98