Finding the Fourth Proportional to 2,720.37, 4,080.12 and 772.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,720.37 : 4,080.12 = 772.71 : x
2. Step 2: Convert to fraction form
   2,720.37/4,080.12 = 772.71/x
3. Step 3: Cross multiply
   2,720.37x = 4,080.12 × 772.71
4. Step 4: Simplify right side
   2,720.37x = 3,152,749.53
5. Step 5: Solve for x
   x = 3,152,749.53/2,720.37
6. Step 6: Final answer
   x = 1,158.94