Finding the Fourth Proportional to 2,112.16, 3,168.86 and 879.34

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.16 : 3,168.86 = 879.34 : x
2. Step 2: Convert to fraction form
   2,112.16/3,168.86 = 879.34/x
3. Step 3: Cross multiply
   2,112.16x = 3,168.86 × 879.34
4. Step 4: Simplify right side
   2,112.16x = 2,786,505.35
5. Step 5: Solve for x
   x = 2,786,505.35/2,112.16
6. Step 6: Final answer
   x = 1,319.27