Finding the Fourth Proportional to 2,218.53, 3,328.58 and 985.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.53 : 3,328.58 = 985.83 : x
2. Step 2: Convert to fraction form
   2,218.53/3,328.58 = 985.83/x
3. Step 3: Cross multiply
   2,218.53x = 3,328.58 × 985.83
4. Step 4: Simplify right side
   2,218.53x = 3,281,414.02
5. Step 5: Solve for x
   x = 3,281,414.02/2,218.53
6. Step 6: Final answer
   x = 1,479.09