Finding the Fourth Proportional to 15,446.71, 21,300.55 and 13,215.97

Step by Step Solution

1. Step 1: Write the proportion equation
   15,446.71 : 21,300.55 = 13,215.97 : x
2. Step 2: Convert to fraction form
   15,446.71/21,300.55 = 13,215.97/x
3. Step 3: Cross multiply
   15,446.71x = 21,300.55 × 13,215.97
4. Step 4: Simplify right side
   15,446.71x = 281,507,429.78
5. Step 5: Solve for x
   x = 281,507,429.78/15,446.71
6. Step 6: Final answer
   x = 18,224.43