Finding the Fourth Proportional to 2,720.17, 4,080.12 and 772.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,720.17 : 4,080.12 = 772.12 : x
2. Step 2: Convert to fraction form
   2,720.17/4,080.12 = 772.12/x
3. Step 3: Cross multiply
   2,720.17x = 4,080.12 × 772.12
4. Step 4: Simplify right side
   2,720.17x = 3,150,342.25
5. Step 5: Solve for x
   x = 3,150,342.25/2,720.17
6. Step 6: Final answer
   x = 1,158.14