Finding the Fourth Proportional to 21,185.26, 31,779.90 and 7,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.26 : 31,779.90 = 7,144.72 : x
2. Step 2: Convert to fraction form
   21,185.26/31,779.90 = 7,144.72/x
3. Step 3: Cross multiply
   21,185.26x = 31,779.90 × 7,144.72
4. Step 4: Simplify right side
   21,185.26x = 227,058,487.13
5. Step 5: Solve for x
   x = 227,058,487.13/21,185.26
6. Step 6: Final answer
   x = 10,717.76