Finding the Fourth Proportional to 2,111.41, 3,167.70 and 879.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.41 : 3,167.70 = 879.40 : x
2. Step 2: Convert to fraction form
   2,111.41/3,167.70 = 879.40/x
3. Step 3: Cross multiply
   2,111.41x = 3,167.70 × 879.40
4. Step 4: Simplify right side
   2,111.41x = 2,785,675.38
5. Step 5: Solve for x
   x = 2,785,675.38/2,111.41
6. Step 6: Final answer
   x = 1,319.34