Finding the Fourth Proportional to 2,628.83, 3,943.86 and 779.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.83 : 3,943.86 = 779.96 : x
2. Step 2: Convert to fraction form
   2,628.83/3,943.86 = 779.96/x
3. Step 3: Cross multiply
   2,628.83x = 3,943.86 × 779.96
4. Step 4: Simplify right side
   2,628.83x = 3,076,029.43
5. Step 5: Solve for x
   x = 3,076,029.43/2,628.83
6. Step 6: Final answer
   x = 1,170.12