Finding the Fourth Proportional to 2,111.29, 3,167.75 and 878.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.29 : 3,167.75 = 878.38 : x
2. Step 2: Convert to fraction form
   2,111.29/3,167.75 = 878.38/x
3. Step 3: Cross multiply
   2,111.29x = 3,167.75 × 878.38
4. Step 4: Simplify right side
   2,111.29x = 2,782,488.25
5. Step 5: Solve for x
   x = 2,782,488.25/2,111.29
6. Step 6: Final answer
   x = 1,317.91