Finding the Fourth Proportional to 2,820.05, 4,230.49 and 872.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.05 : 4,230.49 = 872.41 : x
2. Step 2: Convert to fraction form
   2,820.05/4,230.49 = 872.41/x
3. Step 3: Cross multiply
   2,820.05x = 4,230.49 × 872.41
4. Step 4: Simplify right side
   2,820.05x = 3,690,709.02
5. Step 5: Solve for x
   x = 3,690,709.02/2,820.05
6. Step 6: Final answer
   x = 1,308.74