Finding the Fourth Proportional to 8,929.72, 12,309.60 and 5,939.20

Step by Step Solution

1. Step 1: Write the proportion equation
   8,929.72 : 12,309.60 = 5,939.20 : x
2. Step 2: Convert to fraction form
   8,929.72/12,309.60 = 5,939.20/x
3. Step 3: Cross multiply
   8,929.72x = 12,309.60 × 5,939.20
4. Step 4: Simplify right side
   8,929.72x = 73,109,176.32
5. Step 5: Solve for x
   x = 73,109,176.32/8,929.72
6. Step 6: Final answer
   x = 8,187.17