Finding the Fourth Proportional to 8,521.86, 12,786.57 and 3,325.98

Step by Step Solution

1. Step 1: Write the proportion equation
   8,521.86 : 12,786.57 = 3,325.98 : x
2. Step 2: Convert to fraction form
   8,521.86/12,786.57 = 3,325.98/x
3. Step 3: Cross multiply
   8,521.86x = 12,786.57 × 3,325.98
4. Step 4: Simplify right side
   8,521.86x = 42,527,876.09
5. Step 5: Solve for x
   x = 42,527,876.09/8,521.86
6. Step 6: Final answer
   x = 4,990.45