Finding the Fourth Proportional to 2,111.05, 3,165.91 and 878.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.05 : 3,165.91 = 878.23 : x
2. Step 2: Convert to fraction form
   2,111.05/3,165.91 = 878.23/x
3. Step 3: Cross multiply
   2,111.05x = 3,165.91 × 878.23
4. Step 4: Simplify right side
   2,111.05x = 2,780,387.03
5. Step 5: Solve for x
   x = 2,780,387.03/2,111.05
6. Step 6: Final answer
   x = 1,317.07