Finding the Fourth Proportional to 2,290.40, 3,160.91 and 1,295.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.40 : 3,160.91 = 1,295.72 : x
2. Step 2: Convert to fraction form
   2,290.40/3,160.91 = 1,295.72/x
3. Step 3: Cross multiply
   2,290.40x = 3,160.91 × 1,295.72
4. Step 4: Simplify right side
   2,290.40x = 4,095,647.83
5. Step 5: Solve for x
   x = 4,095,647.83/2,290.40
6. Step 6: Final answer
   x = 1,788.18