Finding the Fourth Proportional to 2,610.18, 3,915.80 and 878.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.18 : 3,915.80 = 878.76 : x
2. Step 2: Convert to fraction form
   2,610.18/3,915.80 = 878.76/x
3. Step 3: Cross multiply
   2,610.18x = 3,915.80 × 878.76
4. Step 4: Simplify right side
   2,610.18x = 3,441,048.41
5. Step 5: Solve for x
   x = 3,441,048.41/2,610.18
6. Step 6: Final answer
   x = 1,318.32