Finding the Fourth Proportional to 5,647.35, 7,788.74 and 3,974.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,647.35 : 7,788.74 = 3,974.30 : x
2. Step 2: Convert to fraction form
   5,647.35/7,788.74 = 3,974.30/x
3. Step 3: Cross multiply
   5,647.35x = 7,788.74 × 3,974.30
4. Step 4: Simplify right side
   5,647.35x = 30,954,789.38
5. Step 5: Solve for x
   x = 30,954,789.38/5,647.35
6. Step 6: Final answer
   x = 5,481.29