Finding the Fourth Proportional to 2,723.72, 4,085.78 and 776.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,723.72 : 4,085.78 = 776.07 : x
2. Step 2: Convert to fraction form
   2,723.72/4,085.78 = 776.07/x
3. Step 3: Cross multiply
   2,723.72x = 4,085.78 × 776.07
4. Step 4: Simplify right side
   2,723.72x = 3,170,847.40
5. Step 5: Solve for x
   x = 3,170,847.40/2,723.72
6. Step 6: Final answer
   x = 1,164.16