Finding the Fourth Proportional to 17,280.50, 25,926.88 and 8,521.62

Step by Step Solution

1. Step 1: Write the proportion equation
   17,280.50 : 25,926.88 = 8,521.62 : x
2. Step 2: Convert to fraction form
   17,280.50/25,926.88 = 8,521.62/x
3. Step 3: Cross multiply
   17,280.50x = 25,926.88 × 8,521.62
4. Step 4: Simplify right side
   17,280.50x = 220,939,019.15
5. Step 5: Solve for x
   x = 220,939,019.15/17,280.50
6. Step 6: Final answer
   x = 12,785.45