Finding the Fourth Proportional to 2,287.46, 3,156.72 and 1,239.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.46 : 3,156.72 = 1,239.52 : x
2. Step 2: Convert to fraction form
   2,287.46/3,156.72 = 1,239.52/x
3. Step 3: Cross multiply
   2,287.46x = 3,156.72 × 1,239.52
4. Step 4: Simplify right side
   2,287.46x = 3,912,817.57
5. Step 5: Solve for x
   x = 3,912,817.57/2,287.46
6. Step 6: Final answer
   x = 1,710.55