Finding the Fourth Proportional to 2,820.56, 4,231.38 and 1,415.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,820.56 : 4,231.38 = 1,415.72 : x
2. Step 2: Convert to fraction form
   2,820.56/4,231.38 = 1,415.72/x
3. Step 3: Cross multiply
   2,820.56x = 4,231.38 × 1,415.72
4. Step 4: Simplify right side
   2,820.56x = 5,990,449.29
5. Step 5: Solve for x
   x = 5,990,449.29/2,820.56
6. Step 6: Final answer
   x = 2,123.85