Finding the Fourth Proportional to 15,767.31, 21,759.89 and 8,693.73

Step by Step Solution

1. Step 1: Write the proportion equation
   15,767.31 : 21,759.89 = 8,693.73 : x
2. Step 2: Convert to fraction form
   15,767.31/21,759.89 = 8,693.73/x
3. Step 3: Cross multiply
   15,767.31x = 21,759.89 × 8,693.73
4. Step 4: Simplify right side
   15,767.31x = 189,174,608.49
5. Step 5: Solve for x
   x = 189,174,608.49/15,767.31
6. Step 6: Final answer
   x = 11,997.90