Finding the Fourth Proportional to 2,290.78, 3,161.01 and 1,296.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.78 : 3,161.01 = 1,296.03 : x
2. Step 2: Convert to fraction form
   2,290.78/3,161.01 = 1,296.03/x
3. Step 3: Cross multiply
   2,290.78x = 3,161.01 × 1,296.03
4. Step 4: Simplify right side
   2,290.78x = 4,096,763.79
5. Step 5: Solve for x
   x = 4,096,763.79/2,290.78
6. Step 6: Final answer
   x = 1,788.37