Finding the Fourth Proportional to 12,072.21, 18,105.55 and 3,307.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,072.21 : 18,105.55 = 3,307.81 : x
2. Step 2: Convert to fraction form
   12,072.21/18,105.55 = 3,307.81/x
3. Step 3: Cross multiply
   12,072.21x = 18,105.55 × 3,307.81
4. Step 4: Simplify right side
   12,072.21x = 59,889,719.35
5. Step 5: Solve for x
   x = 59,889,719.35/12,072.21
6. Step 6: Final answer
   x = 4,960.96