Finding the Fourth Proportional to 2,661.56, 3,992.42 and 1,121.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.56 : 3,992.42 = 1,121.48 : x
2. Step 2: Convert to fraction form
   2,661.56/3,992.42 = 1,121.48/x
3. Step 3: Cross multiply
   2,661.56x = 3,992.42 × 1,121.48
4. Step 4: Simplify right side
   2,661.56x = 4,477,419.18
5. Step 5: Solve for x
   x = 4,477,419.18/2,661.56
6. Step 6: Final answer
   x = 1,682.25