Finding the Fourth Proportional to 1,079.38, 1,617.72 and 591.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.38 : 1,617.72 = 591.58 : x
2. Step 2: Convert to fraction form
   1,079.38/1,617.72 = 591.58/x
3. Step 3: Cross multiply
   1,079.38x = 1,617.72 × 591.58
4. Step 4: Simplify right side
   1,079.38x = 957,010.80
5. Step 5: Solve for x
   x = 957,010.80/1,079.38
6. Step 6: Final answer
   x = 886.63