Finding the Fourth Proportional to 19,965.69, 29,930.72 and 8,271.45

Step by Step Solution

1. Step 1: Write the proportion equation
   19,965.69 : 29,930.72 = 8,271.45 : x
2. Step 2: Convert to fraction form
   19,965.69/29,930.72 = 8,271.45/x
3. Step 3: Cross multiply
   19,965.69x = 29,930.72 × 8,271.45
4. Step 4: Simplify right side
   19,965.69x = 247,570,412.59
5. Step 5: Solve for x
   x = 247,570,412.59/19,965.69
6. Step 6: Final answer
   x = 12,399.79