Finding the Fourth Proportional to 1,003.89, 1,504.68 and 387.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,003.89 : 1,504.68 = 387.27 : x
2. Step 2: Convert to fraction form
   1,003.89/1,504.68 = 387.27/x
3. Step 3: Cross multiply
   1,003.89x = 1,504.68 × 387.27
4. Step 4: Simplify right side
   1,003.89x = 582,717.42
5. Step 5: Solve for x
   x = 582,717.42/1,003.89
6. Step 6: Final answer
   x = 580.46