Finding the Fourth Proportional to 2,111.03, 3,167.49 and 878.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.03 : 3,167.49 = 878.71 : x
2. Step 2: Convert to fraction form
   2,111.03/3,167.49 = 878.71/x
3. Step 3: Cross multiply
   2,111.03x = 3,167.49 × 878.71
4. Step 4: Simplify right side
   2,111.03x = 2,783,289.30
5. Step 5: Solve for x
   x = 2,783,289.30/2,111.03
6. Step 6: Final answer
   x = 1,318.45