Finding the Fourth Proportional to 2,290.98, 3,161.55 and 1,243.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.98 : 3,161.55 = 1,243.05 : x
2. Step 2: Convert to fraction form
   2,290.98/3,161.55 = 1,243.05/x
3. Step 3: Cross multiply
   2,290.98x = 3,161.55 × 1,243.05
4. Step 4: Simplify right side
   2,290.98x = 3,929,964.73
5. Step 5: Solve for x
   x = 3,929,964.73/2,290.98
6. Step 6: Final answer
   x = 1,715.41