Finding the Fourth Proportional to 2,111.94, 3,167.07 and 878.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.94 : 3,167.07 = 878.70 : x
2. Step 2: Convert to fraction form
   2,111.94/3,167.07 = 878.70/x
3. Step 3: Cross multiply
   2,111.94x = 3,167.07 × 878.70
4. Step 4: Simplify right side
   2,111.94x = 2,782,904.41
5. Step 5: Solve for x
   x = 2,782,904.41/2,111.94
6. Step 6: Final answer
   x = 1,317.70