Finding the Fourth Proportional to 2,261.15, 3,120.39 and 1,266.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,261.15 : 3,120.39 = 1,266.50 : x
2. Step 2: Convert to fraction form
   2,261.15/3,120.39 = 1,266.50/x
3. Step 3: Cross multiply
   2,261.15x = 3,120.39 × 1,266.50
4. Step 4: Simplify right side
   2,261.15x = 3,951,958.33
5. Step 5: Solve for x
   x = 3,951,958.33/2,261.15
6. Step 6: Final answer
   x = 1,747.77