Finding the Fourth Proportional to 1,058.16, 1,587.59 and 667.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.16 : 1,587.59 = 667.71 : x
2. Step 2: Convert to fraction form
   1,058.16/1,587.59 = 667.71/x
3. Step 3: Cross multiply
   1,058.16x = 1,587.59 × 667.71
4. Step 4: Simplify right side
   1,058.16x = 1,060,049.72
5. Step 5: Solve for x
   x = 1,060,049.72/1,058.16
6. Step 6: Final answer
   x = 1,001.79