Finding the Fourth Proportional to 2,521.27, 3,782.31 and 878.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.27 : 3,782.31 = 878.05 : x
2. Step 2: Convert to fraction form
   2,521.27/3,782.31 = 878.05/x
3. Step 3: Cross multiply
   2,521.27x = 3,782.31 × 878.05
4. Step 4: Simplify right side
   2,521.27x = 3,321,057.30
5. Step 5: Solve for x
   x = 3,321,057.30/2,521.27
6. Step 6: Final answer
   x = 1,317.22