Finding the Fourth Proportional to 1,155.97, 1,730.16 and 880.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.97 : 1,730.16 = 880.57 : x
2. Step 2: Convert to fraction form
   1,155.97/1,730.16 = 880.57/x
3. Step 3: Cross multiply
   1,155.97x = 1,730.16 × 880.57
4. Step 4: Simplify right side
   1,155.97x = 1,523,529.15
5. Step 5: Solve for x
   x = 1,523,529.15/1,155.97
6. Step 6: Final answer
   x = 1,317.96