Finding the Fourth Proportional to 2,850.76, 4,275.72 and 770.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,850.76 : 4,275.72 = 770.88 : x
2. Step 2: Convert to fraction form
   2,850.76/4,275.72 = 770.88/x
3. Step 3: Cross multiply
   2,850.76x = 4,275.72 × 770.88
4. Step 4: Simplify right side
   2,850.76x = 3,296,067.03
5. Step 5: Solve for x
   x = 3,296,067.03/2,850.76
6. Step 6: Final answer
   x = 1,156.21