Finding the Fourth Proportional to 8,145.56, 12,213.30 and 5,540.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,145.56 : 12,213.30 = 5,540.60 : x
2. Step 2: Convert to fraction form
   8,145.56/12,213.30 = 5,540.60/x
3. Step 3: Cross multiply
   8,145.56x = 12,213.30 × 5,540.60
4. Step 4: Simplify right side
   8,145.56x = 67,669,009.98
5. Step 5: Solve for x
   x = 67,669,009.98/8,145.56
6. Step 6: Final answer
   x = 8,307.47