Finding the Fourth Proportional to 15,863.56, 21,891.71 and 9,490.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,863.56 : 21,891.71 = 9,490.42 : x
2. Step 2: Convert to fraction form
   15,863.56/21,891.71 = 9,490.42/x
3. Step 3: Cross multiply
   15,863.56x = 21,891.71 × 9,490.42
4. Step 4: Simplify right side
   15,863.56x = 207,761,522.42
5. Step 5: Solve for x
   x = 207,761,522.42/15,863.56
6. Step 6: Final answer
   x = 13,096.78