Finding the Fourth Proportional to 2,610.28, 3,914.60 and 878.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.28 : 3,914.60 = 878.50 : x
2. Step 2: Convert to fraction form
   2,610.28/3,914.60 = 878.50/x
3. Step 3: Cross multiply
   2,610.28x = 3,914.60 × 878.50
4. Step 4: Simplify right side
   2,610.28x = 3,438,976.10
5. Step 5: Solve for x
   x = 3,438,976.10/2,610.28
6. Step 6: Final answer
   x = 1,317.47