Finding the Fourth Proportional to 2,620.83, 3,931.53 and 771.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.83 : 3,931.53 = 771.96 : x
2. Step 2: Convert to fraction form
   2,620.83/3,931.53 = 771.96/x
3. Step 3: Cross multiply
   2,620.83x = 3,931.53 × 771.96
4. Step 4: Simplify right side
   2,620.83x = 3,034,983.90
5. Step 5: Solve for x
   x = 3,034,983.90/2,620.83
6. Step 6: Final answer
   x = 1,158.02