Finding the Fourth Proportional to 2,111.16, 3,168.09 and 879.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.16 : 3,168.09 = 879.45 : x
2. Step 2: Convert to fraction form
   2,111.16/3,168.09 = 879.45/x
3. Step 3: Cross multiply
   2,111.16x = 3,168.09 × 879.45
4. Step 4: Simplify right side
   2,111.16x = 2,786,176.75
5. Step 5: Solve for x
   x = 2,786,176.75/2,111.16
6. Step 6: Final answer
   x = 1,319.74