Finding the Fourth Proportional to 8,109.22, 12,158.91 and 3,945.03

Step by Step Solution

1. Step 1: Write the proportion equation
   8,109.22 : 12,158.91 = 3,945.03 : x
2. Step 2: Convert to fraction form
   8,109.22/12,158.91 = 3,945.03/x
3. Step 3: Cross multiply
   8,109.22x = 12,158.91 × 3,945.03
4. Step 4: Simplify right side
   8,109.22x = 47,967,264.72
5. Step 5: Solve for x
   x = 47,967,264.72/8,109.22
6. Step 6: Final answer
   x = 5,915.15