Finding the Fourth Proportional to 2,615.56, 3,923.22 and 766.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.56 : 3,923.22 = 766.60 : x
2. Step 2: Convert to fraction form
   2,615.56/3,923.22 = 766.60/x
3. Step 3: Cross multiply
   2,615.56x = 3,923.22 × 766.60
4. Step 4: Simplify right side
   2,615.56x = 3,007,540.45
5. Step 5: Solve for x
   x = 3,007,540.45/2,615.56
6. Step 6: Final answer
   x = 1,149.86