Finding the Fourth Proportional to 2,111.81, 3,167.78 and 879.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.81 : 3,167.78 = 879.26 : x
2. Step 2: Convert to fraction form
   2,111.81/3,167.78 = 879.26/x
3. Step 3: Cross multiply
   2,111.81x = 3,167.78 × 879.26
4. Step 4: Simplify right side
   2,111.81x = 2,785,282.01
5. Step 5: Solve for x
   x = 2,785,282.01/2,111.81
6. Step 6: Final answer
   x = 1,318.91