Finding the Fourth Proportional to 1,996.72, 3,010.28 and 1,855.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,996.72 : 3,010.28 = 1,855.78 : x
2. Step 2: Convert to fraction form
   1,996.72/3,010.28 = 1,855.78/x
3. Step 3: Cross multiply
   1,996.72x = 3,010.28 × 1,855.78
4. Step 4: Simplify right side
   1,996.72x = 5,586,411.05
5. Step 5: Solve for x
   x = 5,586,411.05/1,996.72
6. Step 6: Final answer
   x = 2,797.80