Finding the Fourth Proportional to 2,628.81, 3,943.89 and 779.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.81 : 3,943.89 = 779.94 : x
2. Step 2: Convert to fraction form
   2,628.81/3,943.89 = 779.94/x
3. Step 3: Cross multiply
   2,628.81x = 3,943.89 × 779.94
4. Step 4: Simplify right side
   2,628.81x = 3,075,997.57
5. Step 5: Solve for x
   x = 3,075,997.57/2,628.81
6. Step 6: Final answer
   x = 1,170.11