Finding the Fourth Proportional to 2,339.61, 3,510.90 and 878.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,339.61 : 3,510.90 = 878.64 : x
2. Step 2: Convert to fraction form
   2,339.61/3,510.90 = 878.64/x
3. Step 3: Cross multiply
   2,339.61x = 3,510.90 × 878.64
4. Step 4: Simplify right side
   2,339.61x = 3,084,817.18
5. Step 5: Solve for x
   x = 3,084,817.18/2,339.61
6. Step 6: Final answer
   x = 1,318.52