Finding the Fourth Proportional to 2,629.83, 3,945.36 and 780.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,629.83 : 3,945.36 = 780.96 : x
2. Step 2: Convert to fraction form
   2,629.83/3,945.36 = 780.96/x
3. Step 3: Cross multiply
   2,629.83x = 3,945.36 × 780.96
4. Step 4: Simplify right side
   2,629.83x = 3,081,144.71
5. Step 5: Solve for x
   x = 3,081,144.71/2,629.83
6. Step 6: Final answer
   x = 1,171.62