Finding the Fourth Proportional to 5,325.72, 7,971.16 and 3,919.76

Step by Step Solution

1. Step 1: Write the proportion equation
   5,325.72 : 7,971.16 = 3,919.76 : x
2. Step 2: Convert to fraction form
   5,325.72/7,971.16 = 3,919.76/x
3. Step 3: Cross multiply
   5,325.72x = 7,971.16 × 3,919.76
4. Step 4: Simplify right side
   5,325.72x = 31,245,034.12
5. Step 5: Solve for x
   x = 31,245,034.12/5,325.72
6. Step 6: Final answer
   x = 5,866.82