Finding the Fourth Proportional to 2,290.81, 3,161.30 and 1,296.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.81 : 3,161.30 = 1,296.09 : x
2. Step 2: Convert to fraction form
   2,290.81/3,161.30 = 1,296.09/x
3. Step 3: Cross multiply
   2,290.81x = 3,161.30 × 1,296.09
4. Step 4: Simplify right side
   2,290.81x = 4,097,329.32
5. Step 5: Solve for x
   x = 4,097,329.32/2,290.81
6. Step 6: Final answer
   x = 1,788.59