Finding the Fourth Proportional to 2,489.90, 3,729.89 and 2,285.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,489.90 : 3,729.89 = 2,285.78 : x
2. Step 2: Convert to fraction form
   2,489.90/3,729.89 = 2,285.78/x
3. Step 3: Cross multiply
   2,489.90x = 3,729.89 × 2,285.78
4. Step 4: Simplify right side
   2,489.90x = 8,525,695.03
5. Step 5: Solve for x
   x = 8,525,695.03/2,489.90
6. Step 6: Final answer
   x = 3,424.12