Finding the Fourth Proportional to 2,339.31, 3,509.91 and 878.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.31 : 3,509.91 = 878.88 : x
2. Step 2: Convert to fraction form
   2,339.31/3,509.91 = 878.88/x
3. Step 3: Cross multiply
   2,339.31x = 3,509.91 × 878.88
4. Step 4: Simplify right side
   2,339.31x = 3,084,789.70
5. Step 5: Solve for x
   x = 3,084,789.70/2,339.31
6. Step 6: Final answer
   x = 1,318.68