Finding the Fourth Proportional to 15,563.91, 21,478.05 and 8,490.27

Step by Step Solution

1. Step 1: Write the proportion equation
   15,563.91 : 21,478.05 = 8,490.27 : x
2. Step 2: Convert to fraction form
   15,563.91/21,478.05 = 8,490.27/x
3. Step 3: Cross multiply
   15,563.91x = 21,478.05 × 8,490.27
4. Step 4: Simplify right side
   15,563.91x = 182,354,443.57
5. Step 5: Solve for x
   x = 182,354,443.57/15,563.91
6. Step 6: Final answer
   x = 11,716.49