Finding the Fourth Proportional to 11,989.98, 17,960.76 and 7,296.21

Step by Step Solution

1. Step 1: Write the proportion equation
   11,989.98 : 17,960.76 = 7,296.21 : x
2. Step 2: Convert to fraction form
   11,989.98/17,960.76 = 7,296.21/x
3. Step 3: Cross multiply
   11,989.98x = 17,960.76 × 7,296.21
4. Step 4: Simplify right side
   11,989.98x = 131,045,476.72
5. Step 5: Solve for x
   x = 131,045,476.72/11,989.98
6. Step 6: Final answer
   x = 10,929.58