Finding the Fourth Proportional to 12,086.86, 18,109.08 and 8,391.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.86 : 18,109.08 = 8,391.46 : x
2. Step 2: Convert to fraction form
   12,086.86/18,109.08 = 8,391.46/x
3. Step 3: Cross multiply
   12,086.86x = 18,109.08 × 8,391.46
4. Step 4: Simplify right side
   12,086.86x = 151,961,620.46
5. Step 5: Solve for x
   x = 151,961,620.46/12,086.86
6. Step 6: Final answer
   x = 12,572.46