Finding the Fourth Proportional to 1,728.72, 2,594.88 and 1,155.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.72 : 2,594.88 = 1,155.60 : x
2. Step 2: Convert to fraction form
   1,728.72/2,594.88 = 1,155.60/x
3. Step 3: Cross multiply
   1,728.72x = 2,594.88 × 1,155.60
4. Step 4: Simplify right side
   1,728.72x = 2,998,643.33
5. Step 5: Solve for x
   x = 2,998,643.33/1,728.72
6. Step 6: Final answer
   x = 1,734.60