Finding the Fourth Proportional to 2,112.76, 3,170.55 and 880.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.76 : 3,170.55 = 880.16 : x
2. Step 2: Convert to fraction form
   2,112.76/3,170.55 = 880.16/x
3. Step 3: Cross multiply
   2,112.76x = 3,170.55 × 880.16
4. Step 4: Simplify right side
   2,112.76x = 2,790,591.29
5. Step 5: Solve for x
   x = 2,790,591.29/2,112.76
6. Step 6: Final answer
   x = 1,320.83