Finding the Fourth Proportional to 2,111.49, 3,165.21 and 879.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.49 : 3,165.21 = 879.75 : x
2. Step 2: Convert to fraction form
   2,111.49/3,165.21 = 879.75/x
3. Step 3: Cross multiply
   2,111.49x = 3,165.21 × 879.75
4. Step 4: Simplify right side
   2,111.49x = 2,784,593.50
5. Step 5: Solve for x
   x = 2,784,593.50/2,111.49
6. Step 6: Final answer
   x = 1,318.78