Finding the Fourth Proportional to 8,145.48, 12,215.49 and 5,182.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,145.48 : 12,215.49 = 5,182.10 : x
2. Step 2: Convert to fraction form
   8,145.48/12,215.49 = 5,182.10/x
3. Step 3: Cross multiply
   8,145.48x = 12,215.49 × 5,182.10
4. Step 4: Simplify right side
   8,145.48x = 63,301,890.73
5. Step 5: Solve for x
   x = 63,301,890.73/8,145.48
6. Step 6: Final answer
   x = 7,771.41