Finding the Fourth Proportional to 2,650.91, 3,976.92 and 776.84

Step by Step Solution

1. Step 1: Write the proportion equation
   2,650.91 : 3,976.92 = 776.84 : x
2. Step 2: Convert to fraction form
   2,650.91/3,976.92 = 776.84/x
3. Step 3: Cross multiply
   2,650.91x = 3,976.92 × 776.84
4. Step 4: Simplify right side
   2,650.91x = 3,089,410.65
5. Step 5: Solve for x
   x = 3,089,410.65/2,650.91
6. Step 6: Final answer
   x = 1,165.42