Finding the Fourth Proportional to 21,461.98, 29,615.92 and 12,028.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,461.98 : 29,615.92 = 12,028.72 : x
2. Step 2: Convert to fraction form
   21,461.98/29,615.92 = 12,028.72/x
3. Step 3: Cross multiply
   21,461.98x = 29,615.92 × 12,028.72
4. Step 4: Simplify right side
   21,461.98x = 356,241,609.22
5. Step 5: Solve for x
   x = 356,241,609.22/21,461.98
6. Step 6: Final answer
   x = 16,598.73