Finding the Fourth Proportional to 1,997.72, 3,011.79 and 1,856.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,997.72 : 3,011.79 = 1,856.78 : x
2. Step 2: Convert to fraction form
   1,997.72/3,011.79 = 1,856.78/x
3. Step 3: Cross multiply
   1,997.72x = 3,011.79 × 1,856.78
4. Step 4: Simplify right side
   1,997.72x = 5,592,231.44
5. Step 5: Solve for x
   x = 5,592,231.44/1,997.72
6. Step 6: Final answer
   x = 2,799.31