Finding the Fourth Proportional to 2,958.57, 4,438.72 and 878.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,958.57 : 4,438.72 = 878.63 : x
2. Step 2: Convert to fraction form
   2,958.57/4,438.72 = 878.63/x
3. Step 3: Cross multiply
   2,958.57x = 4,438.72 × 878.63
4. Step 4: Simplify right side
   2,958.57x = 3,899,992.55
5. Step 5: Solve for x
   x = 3,899,992.55/2,958.57
6. Step 6: Final answer
   x = 1,318.20