Finding the Fourth Proportional to 2,610.12, 3,915.54 and 878.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.12 : 3,915.54 = 878.34 : x
2. Step 2: Convert to fraction form
   2,610.12/3,915.54 = 878.34/x
3. Step 3: Cross multiply
   2,610.12x = 3,915.54 × 878.34
4. Step 4: Simplify right side
   2,610.12x = 3,439,175.40
5. Step 5: Solve for x
   x = 3,439,175.40/2,610.12
6. Step 6: Final answer
   x = 1,317.63