Finding the Fourth Proportional to 12,980.88, 17,913.65 and 7,315.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,980.88 : 17,913.65 = 7,315.64 : x
2. Step 2: Convert to fraction form
   12,980.88/17,913.65 = 7,315.64/x
3. Step 3: Cross multiply
   12,980.88x = 17,913.65 × 7,315.64
4. Step 4: Simplify right side
   12,980.88x = 131,049,822.69
5. Step 5: Solve for x
   x = 131,049,822.69/12,980.88
6. Step 6: Final answer
   x = 10,095.60