Finding the Fourth Proportional to 2,629.33, 3,944.03 and 780.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.33 : 3,944.03 = 780.40 : x
2. Step 2: Convert to fraction form
   2,629.33/3,944.03 = 780.40/x
3. Step 3: Cross multiply
   2,629.33x = 3,944.03 × 780.40
4. Step 4: Simplify right side
   2,629.33x = 3,077,907.25
5. Step 5: Solve for x
   x = 3,077,907.25/2,629.33
6. Step 6: Final answer
   x = 1,170.61