Finding the Fourth Proportional to 2,629.31, 3,943.83 and 780.44

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.31 : 3,943.83 = 780.44 : x
2. Step 2: Convert to fraction form
   2,629.31/3,943.83 = 780.44/x
3. Step 3: Cross multiply
   2,629.31x = 3,943.83 × 780.44
4. Step 4: Simplify right side
   2,629.31x = 3,077,922.69
5. Step 5: Solve for x
   x = 3,077,922.69/2,629.31
6. Step 6: Final answer
   x = 1,170.62