Finding the Fourth Proportional to 1,508.77, 2,081.89 and 878.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,508.77 : 2,081.89 = 878.81 : x
2. Step 2: Convert to fraction form
   1,508.77/2,081.89 = 878.81/x
3. Step 3: Cross multiply
   1,508.77x = 2,081.89 × 878.81
4. Step 4: Simplify right side
   1,508.77x = 1,829,585.75
5. Step 5: Solve for x
   x = 1,829,585.75/1,508.77
6. Step 6: Final answer
   x = 1,212.63