Finding the Fourth Proportional to 8,083.48, 12,130.40 and 5,315.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,083.48 : 12,130.40 = 5,315.72 : x
2. Step 2: Convert to fraction form
   8,083.48/12,130.40 = 5,315.72/x
3. Step 3: Cross multiply
   8,083.48x = 12,130.40 × 5,315.72
4. Step 4: Simplify right side
   8,083.48x = 64,481,809.89
5. Step 5: Solve for x
   x = 64,481,809.89/8,083.48
6. Step 6: Final answer
   x = 7,976.99