Finding the Fourth Proportional to 2,290.27, 3,160.63 and 1,405.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.27 : 3,160.63 = 1,405.55 : x
2. Step 2: Convert to fraction form
   2,290.27/3,160.63 = 1,405.55/x
3. Step 3: Cross multiply
   2,290.27x = 3,160.63 × 1,405.55
4. Step 4: Simplify right side
   2,290.27x = 4,442,407.69
5. Step 5: Solve for x
   x = 4,442,407.69/2,290.27
6. Step 6: Final answer
   x = 1,939.69