Finding the Fourth Proportional to 12,072.58, 18,105.39 and 3,307.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,072.58 : 18,105.39 = 3,307.78 : x
2. Step 2: Convert to fraction form
   12,072.58/18,105.39 = 3,307.78/x
3. Step 3: Cross multiply
   12,072.58x = 18,105.39 × 3,307.78
4. Step 4: Simplify right side
   12,072.58x = 59,888,646.93
5. Step 5: Solve for x
   x = 59,888,646.93/12,072.58
6. Step 6: Final answer
   x = 4,960.72