Finding the Fourth Proportional to 1,071.58, 1,596.17 and 1,058.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.58 : 1,596.17 = 1,058.80 : x
2. Step 2: Convert to fraction form
   1,071.58/1,596.17 = 1,058.80/x
3. Step 3: Cross multiply
   1,071.58x = 1,596.17 × 1,058.80
4. Step 4: Simplify right side
   1,071.58x = 1,690,024.80
5. Step 5: Solve for x
   x = 1,690,024.80/1,071.58
6. Step 6: Final answer
   x = 1,577.13