Finding the Fourth Proportional to 1,155.38, 1,734.28 and 578.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,155.38 : 1,734.28 = 578.25 : x
2. Step 2: Convert to fraction form
   1,155.38/1,734.28 = 578.25/x
3. Step 3: Cross multiply
   1,155.38x = 1,734.28 × 578.25
4. Step 4: Simplify right side
   1,155.38x = 1,002,845.96
5. Step 5: Solve for x
   x = 1,002,845.96/1,155.38
6. Step 6: Final answer
   x = 867.98