Finding the Fourth Proportional to 12,980.48, 17,913.13 and 7,315.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.48 : 17,913.13 = 7,315.31 : x
2. Step 2: Convert to fraction form
   12,980.48/17,913.13 = 7,315.31/x
3. Step 3: Cross multiply
   12,980.48x = 17,913.13 × 7,315.31
4. Step 4: Simplify right side
   12,980.48x = 131,040,125.51
5. Step 5: Solve for x
   x = 131,040,125.51/12,980.48
6. Step 6: Final answer
   x = 10,095.17