Finding the Fourth Proportional to 2,720.48, 4,080.32 and 772.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,720.48 : 4,080.32 = 772.72 : x
2. Step 2: Convert to fraction form
   2,720.48/4,080.32 = 772.72/x
3. Step 3: Cross multiply
   2,720.48x = 4,080.32 × 772.72
4. Step 4: Simplify right side
   2,720.48x = 3,152,944.87
5. Step 5: Solve for x
   x = 3,152,944.87/2,720.48
6. Step 6: Final answer
   x = 1,158.97