Finding the Fourth Proportional to 2,629.61, 3,944.07 and 780.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.61 : 3,944.07 = 780.69 : x
2. Step 2: Convert to fraction form
   2,629.61/3,944.07 = 780.69/x
3. Step 3: Cross multiply
   2,629.61x = 3,944.07 × 780.69
4. Step 4: Simplify right side
   2,629.61x = 3,079,096.01
5. Step 5: Solve for x
   x = 3,079,096.01/2,629.61
6. Step 6: Final answer
   x = 1,170.93