Finding the Fourth Proportional to 2,269.11, 3,131.28 and 1,260.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,269.11 : 3,131.28 = 1,260.77 : x
2. Step 2: Convert to fraction form
   2,269.11/3,131.28 = 1,260.77/x
3. Step 3: Cross multiply
   2,269.11x = 3,131.28 × 1,260.77
4. Step 4: Simplify right side
   2,269.11x = 3,947,823.89
5. Step 5: Solve for x
   x = 3,947,823.89/2,269.11
6. Step 6: Final answer
   x = 1,739.81