Finding the Fourth Proportional to 2,629.91, 3,944.19 and 780.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.91 : 3,944.19 = 780.59 : x
2. Step 2: Convert to fraction form
   2,629.91/3,944.19 = 780.59/x
3. Step 3: Cross multiply
   2,629.91x = 3,944.19 × 780.59
4. Step 4: Simplify right side
   2,629.91x = 3,078,795.27
5. Step 5: Solve for x
   x = 3,078,795.27/2,629.91
6. Step 6: Final answer
   x = 1,170.68