Finding the Fourth Proportional to 2,111.94, 3,169.27 and 1,138.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,111.94 : 3,169.27 = 1,138.72 : x
2. Step 2: Convert to fraction form
   2,111.94/3,169.27 = 1,138.72/x
3. Step 3: Cross multiply
   2,111.94x = 3,169.27 × 1,138.72
4. Step 4: Simplify right side
   2,111.94x = 3,608,911.13
5. Step 5: Solve for x
   x = 3,608,911.13/2,111.94
6. Step 6: Final answer
   x = 1,708.81