Finding the Fourth Proportional to 2,615.79, 3,923.26 and 766.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.79 : 3,923.26 = 766.47 : x
2. Step 2: Convert to fraction form
   2,615.79/3,923.26 = 766.47/x
3. Step 3: Cross multiply
   2,615.79x = 3,923.26 × 766.47
4. Step 4: Simplify right side
   2,615.79x = 3,007,061.09
5. Step 5: Solve for x
   x = 3,007,061.09/2,615.79
6. Step 6: Final answer
   x = 1,149.58