Finding the Fourth Proportional to 1,058.86, 1,581.85 and 685.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.86 : 1,581.85 = 685.63 : x
2. Step 2: Convert to fraction form
   1,058.86/1,581.85 = 685.63/x
3. Step 3: Cross multiply
   1,058.86x = 1,581.85 × 685.63
4. Step 4: Simplify right side
   1,058.86x = 1,084,561.90
5. Step 5: Solve for x
   x = 1,084,561.90/1,058.86
6. Step 6: Final answer
   x = 1,024.27