Finding the Fourth Proportional to 2,290.25, 3,160.55 and 1,242.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.25 : 3,160.55 = 1,242.31 : x
2. Step 2: Convert to fraction form
   2,290.25/3,160.55 = 1,242.31/x
3. Step 3: Cross multiply
   2,290.25x = 3,160.55 × 1,242.31
4. Step 4: Simplify right side
   2,290.25x = 3,926,382.87
5. Step 5: Solve for x
   x = 3,926,382.87/2,290.25
6. Step 6: Final answer
   x = 1,714.39