Finding the Fourth Proportional to 2,661.72, 3,989.87 and 1,273.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.72 : 3,989.87 = 1,273.02 : x
2. Step 2: Convert to fraction form
   2,661.72/3,989.87 = 1,273.02/x
3. Step 3: Cross multiply
   2,661.72x = 3,989.87 × 1,273.02
4. Step 4: Simplify right side
   2,661.72x = 5,079,184.31
5. Step 5: Solve for x
   x = 5,079,184.31/2,661.72
6. Step 6: Final answer
   x = 1,908.23