Finding the Fourth Proportional to 2,820.37, 4,231.02 and 872.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.37 : 4,231.02 = 872.56 : x
2. Step 2: Convert to fraction form
   2,820.37/4,231.02 = 872.56/x
3. Step 3: Cross multiply
   2,820.37x = 4,231.02 × 872.56
4. Step 4: Simplify right side
   2,820.37x = 3,691,818.81
5. Step 5: Solve for x
   x = 3,691,818.81/2,820.37
6. Step 6: Final answer
   x = 1,308.98