Finding the Fourth Proportional to 10,666.86, 16,014.15 and 8,203.43

Step by Step Solution

1. Step 1: Write the proportion equation
   10,666.86 : 16,014.15 = 8,203.43 : x
2. Step 2: Convert to fraction form
   10,666.86/16,014.15 = 8,203.43/x
3. Step 3: Cross multiply
   10,666.86x = 16,014.15 × 8,203.43
4. Step 4: Simplify right side
   10,666.86x = 131,370,878.46
5. Step 5: Solve for x
   x = 131,370,878.46/10,666.86
6. Step 6: Final answer
   x = 12,315.80