Finding the Fourth Proportional to 12,379.58, 18,540.76 and 7,438.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,379.58 : 18,540.76 = 7,438.32 : x
2. Step 2: Convert to fraction form
   12,379.58/18,540.76 = 7,438.32/x
3. Step 3: Cross multiply
   12,379.58x = 18,540.76 × 7,438.32
4. Step 4: Simplify right side
   12,379.58x = 137,912,105.92
5. Step 5: Solve for x
   x = 137,912,105.92/12,379.58
6. Step 6: Final answer
   x = 11,140.29