Finding the Fourth Proportional to 2,854.02, 4,280.69 and 773.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,854.02 : 4,280.69 = 773.90 : x
2. Step 2: Convert to fraction form
   2,854.02/4,280.69 = 773.90/x
3. Step 3: Cross multiply
   2,854.02x = 4,280.69 × 773.90
4. Step 4: Simplify right side
   2,854.02x = 3,312,804.59
5. Step 5: Solve for x
   x = 3,312,804.59/2,854.02
6. Step 6: Final answer
   x = 1,160.75