Finding the Fourth Proportional to 2,857.65, 3,942.17 and 1,796.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,857.65 : 3,942.17 = 1,796.72 : x
2. Step 2: Convert to fraction form
   2,857.65/3,942.17 = 1,796.72/x
3. Step 3: Cross multiply
   2,857.65x = 3,942.17 × 1,796.72
4. Step 4: Simplify right side
   2,857.65x = 7,082,953.73
5. Step 5: Solve for x
   x = 7,082,953.73/2,857.65
6. Step 6: Final answer
   x = 2,478.60