Finding the Fourth Proportional to 2,309.27, 3,186.78 and 1,261.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.27 : 3,186.78 = 1,261.33 : x
2. Step 2: Convert to fraction form
   2,309.27/3,186.78 = 1,261.33/x
3. Step 3: Cross multiply
   2,309.27x = 3,186.78 × 1,261.33
4. Step 4: Simplify right side
   2,309.27x = 4,019,565.28
5. Step 5: Solve for x
   x = 4,019,565.28/2,309.27
6. Step 6: Final answer
   x = 1,740.62