Finding the Fourth Proportional to 2,290.12, 3,160.38 and 1,242.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.12 : 3,160.38 = 1,242.18 : x
2. Step 2: Convert to fraction form
   2,290.12/3,160.38 = 1,242.18/x
3. Step 3: Cross multiply
   2,290.12x = 3,160.38 × 1,242.18
4. Step 4: Simplify right side
   2,290.12x = 3,925,760.83
5. Step 5: Solve for x
   x = 3,925,760.83/2,290.12
6. Step 6: Final answer
   x = 1,714.22