Finding the Fourth Proportional to 2,287.89, 3,157.26 and 1,239.93

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.89 : 3,157.26 = 1,239.93 : x
2. Step 2: Convert to fraction form
   2,287.89/3,157.26 = 1,239.93/x
3. Step 3: Cross multiply
   2,287.89x = 3,157.26 × 1,239.93
4. Step 4: Simplify right side
   2,287.89x = 3,914,781.39
5. Step 5: Solve for x
   x = 3,914,781.39/2,287.89
6. Step 6: Final answer
   x = 1,711.09