Finding the Fourth Proportional to 1,508.65, 2,081.95 and 879.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,508.65 : 2,081.95 = 879.55 : x
2. Step 2: Convert to fraction form
   1,508.65/2,081.95 = 879.55/x
3. Step 3: Cross multiply
   1,508.65x = 2,081.95 × 879.55
4. Step 4: Simplify right side
   1,508.65x = 1,831,171.72
5. Step 5: Solve for x
   x = 1,831,171.72/1,508.65
6. Step 6: Final answer
   x = 1,213.78