Finding the Fourth Proportional to 2,111.15, 3,167.86 and 879.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.15 : 3,167.86 = 879.41 : x
2. Step 2: Convert to fraction form
   2,111.15/3,167.86 = 879.41/x
3. Step 3: Cross multiply
   2,111.15x = 3,167.86 × 879.41
4. Step 4: Simplify right side
   2,111.15x = 2,785,847.76
5. Step 5: Solve for x
   x = 2,785,847.76/2,111.15
6. Step 6: Final answer
   x = 1,319.59