Finding the Fourth Proportional to 13,311.27, 18,367.59 and 7,646.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,311.27 : 18,367.59 = 7,646.28 : x
2. Step 2: Convert to fraction form
   13,311.27/18,367.59 = 7,646.28/x
3. Step 3: Cross multiply
   13,311.27x = 18,367.59 × 7,646.28
4. Step 4: Simplify right side
   13,311.27x = 140,443,736.07
5. Step 5: Solve for x
   x = 140,443,736.07/13,311.27
6. Step 6: Final answer
   x = 10,550.74