Finding the Fourth Proportional to 11,721, 17,580.59 and 5,147.24

Step by Step Solution

1. Step 1: Write the proportion equation
   11,721 : 17,580.59 = 5,147.24 : x
2. Step 2: Convert to fraction form
   11,721/17,580.59 = 5,147.24/x
3. Step 3: Cross multiply
   11,721x = 17,580.59 × 5,147.24
4. Step 4: Simplify right side
   11,721x = 90,491,490.34
5. Step 5: Solve for x
   x = 90,491,490.34/11,721
6. Step 6: Final answer
   x = 7,720.46