Finding the Fourth Proportional to 12,309.22, 18,459.72 and 3,986.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.22 : 18,459.72 = 3,986.98 : x
2. Step 2: Convert to fraction form
   12,309.22/18,459.72 = 3,986.98/x
3. Step 3: Cross multiply
   12,309.22x = 18,459.72 × 3,986.98
4. Step 4: Simplify right side
   12,309.22x = 73,598,534.45
5. Step 5: Solve for x
   x = 73,598,534.45/12,309.22
6. Step 6: Final answer
   x = 5,979.14