Finding the Fourth Proportional to 12,456.59, 17,180.37 and 7,980.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.59 : 17,180.37 = 7,980.76 : x
2. Step 2: Convert to fraction form
   12,456.59/17,180.37 = 7,980.76/x
3. Step 3: Cross multiply
   12,456.59x = 17,180.37 × 7,980.76
4. Step 4: Simplify right side
   12,456.59x = 137,112,366.73
5. Step 5: Solve for x
   x = 137,112,366.73/12,456.59
6. Step 6: Final answer
   x = 11,007.22