Finding the Fourth Proportional to 12,379.86, 18,553.59 and 10,729.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,379.86 : 18,553.59 = 10,729.62 : x
2. Step 2: Convert to fraction form
   12,379.86/18,553.59 = 10,729.62/x
3. Step 3: Cross multiply
   12,379.86x = 18,553.59 × 10,729.62
4. Step 4: Simplify right side
   12,379.86x = 199,072,970.34
5. Step 5: Solve for x
   x = 199,072,970.34/12,379.86
6. Step 6: Final answer
   x = 16,080.39