Finding the Fourth Proportional to 11,056.30, 15,241.58 and 8,399.10

Step by Step Solution

1. Step 1: Write the proportion equation
   11,056.30 : 15,241.58 = 8,399.10 : x
2. Step 2: Convert to fraction form
   11,056.30/15,241.58 = 8,399.10/x
3. Step 3: Cross multiply
   11,056.30x = 15,241.58 × 8,399.10
4. Step 4: Simplify right side
   11,056.30x = 128,015,436.37
5. Step 5: Solve for x
   x = 128,015,436.37/11,056.30
6. Step 6: Final answer
   x = 11,578.51