Finding the Fourth Proportional to 2,520.27, 3,780.81 and 877.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,520.27 : 3,780.81 = 877.05 : x
2. Step 2: Convert to fraction form
   2,520.27/3,780.81 = 877.05/x
3. Step 3: Cross multiply
   2,520.27x = 3,780.81 × 877.05
4. Step 4: Simplify right side
   2,520.27x = 3,315,959.41
5. Step 5: Solve for x
   x = 3,315,959.41/2,520.27
6. Step 6: Final answer
   x = 1,315.72