Finding the Fourth Proportional to 12,309.33, 18,459.90 and 3,987.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,309.33 : 18,459.90 = 3,987.12 : x
2. Step 2: Convert to fraction form
   12,309.33/18,459.90 = 3,987.12/x
3. Step 3: Cross multiply
   12,309.33x = 18,459.90 × 3,987.12
4. Step 4: Simplify right side
   12,309.33x = 73,601,836.49
5. Step 5: Solve for x
   x = 73,601,836.49/12,309.33
6. Step 6: Final answer
   x = 5,979.35