Finding the Fourth Proportional to 2,628.91, 3,942.69 and 779.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.91 : 3,942.69 = 779.59 : x
2. Step 2: Convert to fraction form
   2,628.91/3,942.69 = 779.59/x
3. Step 3: Cross multiply
   2,628.91x = 3,942.69 × 779.59
4. Step 4: Simplify right side
   2,628.91x = 3,073,688.09
5. Step 5: Solve for x
   x = 3,073,688.09/2,628.91
6. Step 6: Final answer
   x = 1,169.19