Finding the Fourth Proportional to 21,968.34, 30,309.96 and 12,407.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,968.34 : 30,309.96 = 12,407.72 : x
2. Step 2: Convert to fraction form
   21,968.34/30,309.96 = 12,407.72/x
3. Step 3: Cross multiply
   21,968.34x = 30,309.96 × 12,407.72
4. Step 4: Simplify right side
   21,968.34x = 376,077,496.89
5. Step 5: Solve for x
   x = 376,077,496.89/21,968.34
6. Step 6: Final answer
   x = 17,119.07