Finding the Fourth Proportional to 21,832.31, 30,128.59 and 11,896.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,832.31 : 30,128.59 = 11,896.31 : x
2. Step 2: Convert to fraction form
   21,832.31/30,128.59 = 11,896.31/x
3. Step 3: Cross multiply
   21,832.31x = 30,128.59 × 11,896.31
4. Step 4: Simplify right side
   21,832.31x = 358,419,136.69
5. Step 5: Solve for x
   x = 358,419,136.69/21,832.31
6. Step 6: Final answer
   x = 16,416.91