Finding the Fourth Proportional to 15,650.82, 21,608.37 and 9,691.25

Step by Step Solution

1. Step 1: Write the proportion equation
   15,650.82 : 21,608.37 = 9,691.25 : x
2. Step 2: Convert to fraction form
   15,650.82/21,608.37 = 9,691.25/x
3. Step 3: Cross multiply
   15,650.82x = 21,608.37 × 9,691.25
4. Step 4: Simplify right side
   15,650.82x = 209,412,007.72
5. Step 5: Solve for x
   x = 209,412,007.72/15,650.82
6. Step 6: Final answer
   x = 13,380.26