Finding the Fourth Proportional to 2,548.08, 3,816.78 and 1,311.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,548.08 : 3,816.78 = 1,311.72 : x
2. Step 2: Convert to fraction form
   2,548.08/3,816.78 = 1,311.72/x
3. Step 3: Cross multiply
   2,548.08x = 3,816.78 × 1,311.72
4. Step 4: Simplify right side
   2,548.08x = 5,006,546.66
5. Step 5: Solve for x
   x = 5,006,546.66/2,548.08
6. Step 6: Final answer
   x = 1,964.83