Finding the Fourth Proportional to 12,071.50, 16,647.50 and 8,287.98

Step by Step Solution

1. Step 1: Write the proportion equation
   12,071.50 : 16,647.50 = 8,287.98 : x
2. Step 2: Convert to fraction form
   12,071.50/16,647.50 = 8,287.98/x
3. Step 3: Cross multiply
   12,071.50x = 16,647.50 × 8,287.98
4. Step 4: Simplify right side
   12,071.50x = 137,974,147.05
5. Step 5: Solve for x
   x = 137,974,147.05/12,071.50
6. Step 6: Final answer
   x = 11,429.74