Finding the Fourth Proportional to 2,773.20, 4,157.94 and 1,311

Step by Step Solution

1. Step 1: Write the proportion equation
   2,773.20 : 4,157.94 = 1,311 : x
2. Step 2: Convert to fraction form
   2,773.20/4,157.94 = 1,311/x
3. Step 3: Cross multiply
   2,773.20x = 4,157.94 × 1,311
4. Step 4: Simplify right side
   2,773.20x = 5,451,059.34
5. Step 5: Solve for x
   x = 5,451,059.34/2,773.20
6. Step 6: Final answer
   x = 1,965.62