Finding the Fourth Proportional to 12,109.86, 18,165.15 and 5,179.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.86 : 18,165.15 = 5,179.86 : x
2. Step 2: Convert to fraction form
   12,109.86/18,165.15 = 5,179.86/x
3. Step 3: Cross multiply
   12,109.86x = 18,165.15 × 5,179.86
4. Step 4: Simplify right side
   12,109.86x = 94,092,933.88
5. Step 5: Solve for x
   x = 94,092,933.88/12,109.86
6. Step 6: Final answer
   x = 7,769.94