Finding the Fourth Proportional to 2,629.38, 3,943.62 and 780.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.38 : 3,943.62 = 780.48 : x
2. Step 2: Convert to fraction form
   2,629.38/3,943.62 = 780.48/x
3. Step 3: Cross multiply
   2,629.38x = 3,943.62 × 780.48
4. Step 4: Simplify right side
   2,629.38x = 3,077,916.54
5. Step 5: Solve for x
   x = 3,077,916.54/2,629.38
6. Step 6: Final answer
   x = 1,170.59