Finding the Fourth Proportional to 1,058.59, 1,588.61 and 688.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.59 : 1,588.61 = 688.60 : x
2. Step 2: Convert to fraction form
   1,058.59/1,588.61 = 688.60/x
3. Step 3: Cross multiply
   1,058.59x = 1,588.61 × 688.60
4. Step 4: Simplify right side
   1,058.59x = 1,093,920.55
5. Step 5: Solve for x
   x = 1,093,920.55/1,058.59
6. Step 6: Final answer
   x = 1,033.37