Finding the Fourth Proportional to 11,359.64, 15,680.58 and 8,399.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,359.64 : 15,680.58 = 8,399.30 : x
2. Step 2: Convert to fraction form
   11,359.64/15,680.58 = 8,399.30/x
3. Step 3: Cross multiply
   11,359.64x = 15,680.58 × 8,399.30
4. Step 4: Simplify right side
   11,359.64x = 131,705,895.59
5. Step 5: Solve for x
   x = 131,705,895.59/11,359.64
6. Step 6: Final answer
   x = 11,594.20