Finding the Fourth Proportional to 2,287.82, 3,157.18 and 1,239.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.82 : 3,157.18 = 1,239.88 : x
2. Step 2: Convert to fraction form
   2,287.82/3,157.18 = 1,239.88/x
3. Step 3: Cross multiply
   2,287.82x = 3,157.18 × 1,239.88
4. Step 4: Simplify right side
   2,287.82x = 3,914,524.34
5. Step 5: Solve for x
   x = 3,914,524.34/2,287.82
6. Step 6: Final answer
   x = 1,711.03