Finding the Fourth Proportional to 2,615.49, 3,923.87 and 766.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.49 : 3,923.87 = 766.62 : x
2. Step 2: Convert to fraction form
   2,615.49/3,923.87 = 766.62/x
3. Step 3: Cross multiply
   2,615.49x = 3,923.87 × 766.62
4. Step 4: Simplify right side
   2,615.49x = 3,008,117.22
5. Step 5: Solve for x
   x = 3,008,117.22/2,615.49
6. Step 6: Final answer
   x = 1,150.12