Finding the Fourth Proportional to 2,111.09, 3,166.88 and 878.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.09 : 3,166.88 = 878.33 : x
2. Step 2: Convert to fraction form
   2,111.09/3,166.88 = 878.33/x
3. Step 3: Cross multiply
   2,111.09x = 3,166.88 × 878.33
4. Step 4: Simplify right side
   2,111.09x = 2,781,569.24
5. Step 5: Solve for x
   x = 2,781,569.24/2,111.09
6. Step 6: Final answer
   x = 1,317.60