Finding the Fourth Proportional to 2,826.66, 4,238.37 and 878.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,826.66 : 4,238.37 = 878.34 : x
2. Step 2: Convert to fraction form
   2,826.66/4,238.37 = 878.34/x
3. Step 3: Cross multiply
   2,826.66x = 4,238.37 × 878.34
4. Step 4: Simplify right side
   2,826.66x = 3,722,729.91
5. Step 5: Solve for x
   x = 3,722,729.91/2,826.66
6. Step 6: Final answer
   x = 1,317.01