Finding the Fourth Proportional to 19,223.82, 28,839.98 and 8,139.98

Step by Step Solution

1. Step 1: Write the proportion equation
   19,223.82 : 28,839.98 = 8,139.98 : x
2. Step 2: Convert to fraction form
   19,223.82/28,839.98 = 8,139.98/x
3. Step 3: Cross multiply
   19,223.82x = 28,839.98 × 8,139.98
4. Step 4: Simplify right side
   19,223.82x = 234,756,675.50
5. Step 5: Solve for x
   x = 234,756,675.50/19,223.82
6. Step 6: Final answer
   x = 12,211.76