Finding the Fourth Proportional to 1,508.11, 2,081.33 and 878.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,508.11 : 2,081.33 = 878.61 : x
2. Step 2: Convert to fraction form
   1,508.11/2,081.33 = 878.61/x
3. Step 3: Cross multiply
   1,508.11x = 2,081.33 × 878.61
4. Step 4: Simplify right side
   1,508.11x = 1,828,662.55
5. Step 5: Solve for x
   x = 1,828,662.55/1,508.11
6. Step 6: Final answer
   x = 1,212.55