Finding the Fourth Proportional to 2,287.52, 3,156.78 and 1,239.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.52 : 3,156.78 = 1,239.58 : x
2. Step 2: Convert to fraction form
   2,287.52/3,156.78 = 1,239.58/x
3. Step 3: Cross multiply
   2,287.52x = 3,156.78 × 1,239.58
4. Step 4: Simplify right side
   2,287.52x = 3,913,065.57
5. Step 5: Solve for x
   x = 3,913,065.57/2,287.52
6. Step 6: Final answer
   x = 1,710.61