Finding the Fourth Proportional to 2,290.69, 3,161.15 and 1,242.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.69 : 3,161.15 = 1,242.75 : x
2. Step 2: Convert to fraction form
   2,290.69/3,161.15 = 1,242.75/x
3. Step 3: Cross multiply
   2,290.69x = 3,161.15 × 1,242.75
4. Step 4: Simplify right side
   2,290.69x = 3,928,519.16
5. Step 5: Solve for x
   x = 3,928,519.16/2,290.69
6. Step 6: Final answer
   x = 1,714.99