Finding the Fourth Proportional to 2,290.88, 3,160.22 and 1,405.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.88 : 3,160.22 = 1,405.15 : x
2. Step 2: Convert to fraction form
   2,290.88/3,160.22 = 1,405.15/x
3. Step 3: Cross multiply
   2,290.88x = 3,160.22 × 1,405.15
4. Step 4: Simplify right side
   2,290.88x = 4,440,568.21
5. Step 5: Solve for x
   x = 4,440,568.21/2,290.88
6. Step 6: Final answer
   x = 1,938.37