Finding the Fourth Proportional to 5,120.91, 7,066.78 and 2,882.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,120.91 : 7,066.78 = 2,882.78 : x
2. Step 2: Convert to fraction form
   5,120.91/7,066.78 = 2,882.78/x
3. Step 3: Cross multiply
   5,120.91x = 7,066.78 × 2,882.78
4. Step 4: Simplify right side
   5,120.91x = 20,371,956.01
5. Step 5: Solve for x
   x = 20,371,956.01/5,120.91
6. Step 6: Final answer
   x = 3,978.19