Finding the Fourth Proportional to 2,389.50, 3,585.30 and 1,003.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.50 : 3,585.30 = 1,003.20 : x
2. Step 2: Convert to fraction form
   2,389.50/3,585.30 = 1,003.20/x
3. Step 3: Cross multiply
   2,389.50x = 3,585.30 × 1,003.20
4. Step 4: Simplify right side
   2,389.50x = 3,596,772.96
5. Step 5: Solve for x
   x = 3,596,772.96/2,389.50
6. Step 6: Final answer
   x = 1,505.24