Finding the Fourth Proportional to 21,098, 29,112.72 and 11,665.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,098 : 29,112.72 = 11,665.28 : x
2. Step 2: Convert to fraction form
   21,098/29,112.72 = 11,665.28/x
3. Step 3: Cross multiply
   21,098x = 29,112.72 × 11,665.28
4. Step 4: Simplify right side
   21,098x = 339,608,030.36
5. Step 5: Solve for x
   x = 339,608,030.36/21,098
6. Step 6: Final answer
   x = 16,096.69