Finding the Fourth Proportional to 5,113.39, 7,675.78 and 2,647.55

Step by Step Solution

1. Step 1: Write the proportion equation
   5,113.39 : 7,675.78 = 2,647.55 : x
2. Step 2: Convert to fraction form
   5,113.39/7,675.78 = 2,647.55/x
3. Step 3: Cross multiply
   5,113.39x = 7,675.78 × 2,647.55
4. Step 4: Simplify right side
   5,113.39x = 20,321,992.15
5. Step 5: Solve for x
   x = 20,321,992.15/5,113.39
6. Step 6: Final answer
   x = 3,974.27