Finding the Fourth Proportional to 15,304.12, 21,072.72 and 13,404.76

Step by Step Solution

1. Step 1: Write the proportion equation
   15,304.12 : 21,072.72 = 13,404.76 : x
2. Step 2: Convert to fraction form
   15,304.12/21,072.72 = 13,404.76/x
3. Step 3: Cross multiply
   15,304.12x = 21,072.72 × 13,404.76
4. Step 4: Simplify right side
   15,304.12x = 282,474,754.15
5. Step 5: Solve for x
   x = 282,474,754.15/15,304.12
6. Step 6: Final answer
   x = 18,457.43