Finding the Fourth Proportional to 15,563.34, 21,477.42 and 8,490.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,563.34 : 21,477.42 = 8,490.15 : x
2. Step 2: Convert to fraction form
   15,563.34/21,477.42 = 8,490.15/x
3. Step 3: Cross multiply
   15,563.34x = 21,477.42 × 8,490.15
4. Step 4: Simplify right side
   15,563.34x = 182,346,517.41
5. Step 5: Solve for x
   x = 182,346,517.41/15,563.34
6. Step 6: Final answer
   x = 11,716.41