Finding the Fourth Proportional to 2,112.09, 3,168.38 and 879.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.09 : 3,168.38 = 879.33 : x
2. Step 2: Convert to fraction form
   2,112.09/3,168.38 = 879.33/x
3. Step 3: Cross multiply
   2,112.09x = 3,168.38 × 879.33
4. Step 4: Simplify right side
   2,112.09x = 2,786,051.59
5. Step 5: Solve for x
   x = 2,786,051.59/2,112.09
6. Step 6: Final answer
   x = 1,319.10