Finding the Fourth Proportional to 2,661.42, 3,992.97 and 1,200.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.42 : 3,992.97 = 1,200.30 : x
2. Step 2: Convert to fraction form
   2,661.42/3,992.97 = 1,200.30/x
3. Step 3: Cross multiply
   2,661.42x = 3,992.97 × 1,200.30
4. Step 4: Simplify right side
   2,661.42x = 4,792,761.89
5. Step 5: Solve for x
   x = 4,792,761.89/2,661.42
6. Step 6: Final answer
   x = 1,800.83