Finding the Fourth Proportional to 12,380.68, 18,554.59 and 10,729.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,380.68 : 18,554.59 = 10,729.50 : x
2. Step 2: Convert to fraction form
   12,380.68/18,554.59 = 10,729.50/x
3. Step 3: Cross multiply
   12,380.68x = 18,554.59 × 10,729.50
4. Step 4: Simplify right side
   12,380.68x = 199,081,473.41
5. Step 5: Solve for x
   x = 199,081,473.41/12,380.68
6. Step 6: Final answer
   x = 16,080.01