Finding the Fourth Proportional to 5,111.40, 7,674.12 and 2,647.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,111.40 : 7,674.12 = 2,647.92 : x
2. Step 2: Convert to fraction form
   5,111.40/7,674.12 = 2,647.92/x
3. Step 3: Cross multiply
   5,111.40x = 7,674.12 × 2,647.92
4. Step 4: Simplify right side
   5,111.40x = 20,320,455.83
5. Step 5: Solve for x
   x = 20,320,455.83/5,111.40
6. Step 6: Final answer
   x = 3,975.52