Finding the Fourth Proportional to 2,287.86, 3,157.25 and 1,239.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.86 : 3,157.25 = 1,239.92 : x
2. Step 2: Convert to fraction form
   2,287.86/3,157.25 = 1,239.92/x
3. Step 3: Cross multiply
   2,287.86x = 3,157.25 × 1,239.92
4. Step 4: Simplify right side
   2,287.86x = 3,914,731.22
5. Step 5: Solve for x
   x = 3,914,731.22/2,287.86
6. Step 6: Final answer
   x = 1,711.09