Finding the Fourth Proportional to 21,964.78, 30,309.82 and 12,401.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,964.78 : 30,309.82 = 12,401.72 : x
2. Step 2: Convert to fraction form
   21,964.78/30,309.82 = 12,401.72/x
3. Step 3: Cross multiply
   21,964.78x = 30,309.82 × 12,401.72
4. Step 4: Simplify right side
   21,964.78x = 375,893,900.89
5. Step 5: Solve for x
   x = 375,893,900.89/21,964.78
6. Step 6: Final answer
   x = 17,113.48