Finding the Fourth Proportional to 12,228.72, 18,340.65 and 5,986.05

Step by Step Solution

1. Step 1: Write the proportion equation
   12,228.72 : 18,340.65 = 5,986.05 : x
2. Step 2: Convert to fraction form
   12,228.72/18,340.65 = 5,986.05/x
3. Step 3: Cross multiply
   12,228.72x = 18,340.65 × 5,986.05
4. Step 4: Simplify right side
   12,228.72x = 109,788,047.93
5. Step 5: Solve for x
   x = 109,788,047.93/12,228.72
6. Step 6: Final answer
   x = 8,977.89