Finding the Fourth Proportional to 2,639.24, 3,958.89 and 1,178.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.24 : 3,958.89 = 1,178.47 : x
2. Step 2: Convert to fraction form
   2,639.24/3,958.89 = 1,178.47/x
3. Step 3: Cross multiply
   2,639.24x = 3,958.89 × 1,178.47
4. Step 4: Simplify right side
   2,639.24x = 4,665,433.10
5. Step 5: Solve for x
   x = 4,665,433.10/2,639.24
6. Step 6: Final answer
   x = 1,767.72