Finding the Fourth Proportional to 2,290.16, 3,160.43 and 1,242.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.16 : 3,160.43 = 1,242.23 : x
2. Step 2: Convert to fraction form
   2,290.16/3,160.43 = 1,242.23/x
3. Step 3: Cross multiply
   2,290.16x = 3,160.43 × 1,242.23
4. Step 4: Simplify right side
   2,290.16x = 3,925,980.96
5. Step 5: Solve for x
   x = 3,925,980.96/2,290.16
6. Step 6: Final answer
   x = 1,714.28