Finding the Fourth Proportional to 2,615.92, 3,923.38 and 767.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.92 : 3,923.38 = 767.12 : x
2. Step 2: Convert to fraction form
   2,615.92/3,923.38 = 767.12/x
3. Step 3: Cross multiply
   2,615.92x = 3,923.38 × 767.12
4. Step 4: Simplify right side
   2,615.92x = 3,009,703.27
5. Step 5: Solve for x
   x = 3,009,703.27/2,615.92
6. Step 6: Final answer
   x = 1,150.53