Finding the Fourth Proportional to 2,542.79, 3,816.59 and 1,311.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,542.79 : 3,816.59 = 1,311.05 : x
2. Step 2: Convert to fraction form
   2,542.79/3,816.59 = 1,311.05/x
3. Step 3: Cross multiply
   2,542.79x = 3,816.59 × 1,311.05
4. Step 4: Simplify right side
   2,542.79x = 5,003,714.68
5. Step 5: Solve for x
   x = 5,003,714.68/2,542.79
6. Step 6: Final answer
   x = 1,967.81