Finding the Fourth Proportional to 12,680.76, 17,495.17 and 7,371.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.76 : 17,495.17 = 7,371.21 : x
2. Step 2: Convert to fraction form
   12,680.76/17,495.17 = 7,371.21/x
3. Step 3: Cross multiply
   12,680.76x = 17,495.17 × 7,371.21
4. Step 4: Simplify right side
   12,680.76x = 128,960,572.06
5. Step 5: Solve for x
   x = 128,960,572.06/12,680.76
6. Step 6: Final answer
   x = 10,169.78