Finding the Fourth Proportional to 2,388.72, 3,585 and 928.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.72 : 3,585 = 928.56 : x
2. Step 2: Convert to fraction form
   2,388.72/3,585 = 928.56/x
3. Step 3: Cross multiply
   2,388.72x = 3,585 × 928.56
4. Step 4: Simplify right side
   2,388.72x = 3,328,887.60
5. Step 5: Solve for x
   x = 3,328,887.60/2,388.72
6. Step 6: Final answer
   x = 1,393.59