Finding the Fourth Proportional to 2,112.81, 3,165.96 and 879.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.81 : 3,165.96 = 879.18 : x
2. Step 2: Convert to fraction form
   2,112.81/3,165.96 = 879.18/x
3. Step 3: Cross multiply
   2,112.81x = 3,165.96 × 879.18
4. Step 4: Simplify right side
   2,112.81x = 2,783,448.71
5. Step 5: Solve for x
   x = 2,783,448.71/2,112.81
6. Step 6: Final answer
   x = 1,317.42