Finding the Fourth Proportional to 11,105.34, 16,649.78 and 6,721.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,105.34 : 16,649.78 = 6,721.76 : x
2. Step 2: Convert to fraction form
   11,105.34/16,649.78 = 6,721.76/x
3. Step 3: Cross multiply
   11,105.34x = 16,649.78 × 6,721.76
4. Step 4: Simplify right side
   11,105.34x = 111,915,825.21
5. Step 5: Solve for x
   x = 111,915,825.21/11,105.34
6. Step 6: Final answer
   x = 10,077.66