Finding the Fourth Proportional to 13,279.38, 18,326.01 and 7,311.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,279.38 : 18,326.01 = 7,311.30 : x
2. Step 2: Convert to fraction form
   13,279.38/18,326.01 = 7,311.30/x
3. Step 3: Cross multiply
   13,279.38x = 18,326.01 × 7,311.30
4. Step 4: Simplify right side
   13,279.38x = 133,986,956.91
5. Step 5: Solve for x
   x = 133,986,956.91/13,279.38
6. Step 6: Final answer
   x = 10,089.85