Finding the Fourth Proportional to 1,109.88, 1,665.90 and 1,058.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,109.88 : 1,665.90 = 1,058.58 : x
2. Step 2: Convert to fraction form
   1,109.88/1,665.90 = 1,058.58/x
3. Step 3: Cross multiply
   1,109.88x = 1,665.90 × 1,058.58
4. Step 4: Simplify right side
   1,109.88x = 1,763,488.42
5. Step 5: Solve for x
   x = 1,763,488.42/1,109.88
6. Step 6: Final answer
   x = 1,588.90