Finding the Fourth Proportional to 21,016.87, 29,028.17 and 15,342.41

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.87 : 29,028.17 = 15,342.41 : x
2. Step 2: Convert to fraction form
   21,016.87/29,028.17 = 15,342.41/x
3. Step 3: Cross multiply
   21,016.87x = 29,028.17 × 15,342.41
4. Step 4: Simplify right side
   21,016.87x = 445,362,196.62
5. Step 5: Solve for x
   x = 445,362,196.62/21,016.87
6. Step 6: Final answer
   x = 21,190.70