Finding the Fourth Proportional to 13,279.71, 18,326.15 and 7,311.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,279.71 : 18,326.15 = 7,311.53 : x
2. Step 2: Convert to fraction form
   13,279.71/18,326.15 = 7,311.53/x
3. Step 3: Cross multiply
   13,279.71x = 18,326.15 × 7,311.53
4. Step 4: Simplify right side
   13,279.71x = 133,992,067.32
5. Step 5: Solve for x
   x = 133,992,067.32/13,279.71
6. Step 6: Final answer
   x = 10,089.98