Finding the Fourth Proportional to 2,290.21, 3,160.89 and 1,295.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.21 : 3,160.89 = 1,295.80 : x
2. Step 2: Convert to fraction form
   2,290.21/3,160.89 = 1,295.80/x
3. Step 3: Cross multiply
   2,290.21x = 3,160.89 × 1,295.80
4. Step 4: Simplify right side
   2,290.21x = 4,095,858.98
5. Step 5: Solve for x
   x = 4,095,858.98/2,290.21
6. Step 6: Final answer
   x = 1,788.42