Finding the Fourth Proportional to 2,389.82, 3,585.96 and 985.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,389.82 : 3,585.96 = 985.28 : x
2. Step 2: Convert to fraction form
   2,389.82/3,585.96 = 985.28/x
3. Step 3: Cross multiply
   2,389.82x = 3,585.96 × 985.28
4. Step 4: Simplify right side
   2,389.82x = 3,533,174.67
5. Step 5: Solve for x
   x = 3,533,174.67/2,389.82
6. Step 6: Final answer
   x = 1,478.43