Finding the Fourth Proportional to 12,209.66, 18,315.82 and 3,887.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.66 : 18,315.82 = 3,887.72 : x
2. Step 2: Convert to fraction form
   12,209.66/18,315.82 = 3,887.72/x
3. Step 3: Cross multiply
   12,209.66x = 18,315.82 × 3,887.72
4. Step 4: Simplify right side
   12,209.66x = 71,206,688.15
5. Step 5: Solve for x
   x = 71,206,688.15/12,209.66
6. Step 6: Final answer
   x = 5,832.00