Finding the Fourth Proportional to 2,290.79, 3,161.28 and 1,296.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.79 : 3,161.28 = 1,296.06 : x
2. Step 2: Convert to fraction form
   2,290.79/3,161.28 = 1,296.06/x
3. Step 3: Cross multiply
   2,290.79x = 3,161.28 × 1,296.06
4. Step 4: Simplify right side
   2,290.79x = 4,097,209.98
5. Step 5: Solve for x
   x = 4,097,209.98/2,290.79
6. Step 6: Final answer
   x = 1,788.56