Finding the Fourth Proportional to 21,968.94, 30,311.91 and 12,409.02

Step by Step Solution

1. Step 1: Write the proportion equation
   21,968.94 : 30,311.91 = 12,409.02 : x
2. Step 2: Convert to fraction form
   21,968.94/30,311.91 = 12,409.02/x
3. Step 3: Cross multiply
   21,968.94x = 30,311.91 × 12,409.02
4. Step 4: Simplify right side
   21,968.94x = 376,141,097.43
5. Step 5: Solve for x
   x = 376,141,097.43/21,968.94
6. Step 6: Final answer
   x = 17,121.50