Finding the Fourth Proportional to 3,992.56, 5,987.20 and 1,800.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,992.56 : 5,987.20 = 1,800.72 : x
2. Step 2: Convert to fraction form
   3,992.56/5,987.20 = 1,800.72/x
3. Step 3: Cross multiply
   3,992.56x = 5,987.20 × 1,800.72
4. Step 4: Simplify right side
   3,992.56x = 10,781,270.78
5. Step 5: Solve for x
   x = 10,781,270.78/3,992.56
6. Step 6: Final answer
   x = 2,700.34