Finding the Fourth Proportional to 6,480.72, 9,699.12 and 3,885.48

Step by Step Solution

1. Step 1: Write the proportion equation
   6,480.72 : 9,699.12 = 3,885.48 : x
2. Step 2: Convert to fraction form
   6,480.72/9,699.12 = 3,885.48/x
3. Step 3: Cross multiply
   6,480.72x = 9,699.12 × 3,885.48
4. Step 4: Simplify right side
   6,480.72x = 37,685,736.78
5. Step 5: Solve for x
   x = 37,685,736.78/6,480.72
6. Step 6: Final answer
   x = 5,815.05