Finding the Fourth Proportional to 6,621.72, 9,927.12 and 3,109.92

Step by Step Solution

1. Step 1: Write the proportion equation
   6,621.72 : 9,927.12 = 3,109.92 : x
2. Step 2: Convert to fraction form
   6,621.72/9,927.12 = 3,109.92/x
3. Step 3: Cross multiply
   6,621.72x = 9,927.12 × 3,109.92
4. Step 4: Simplify right side
   6,621.72x = 30,872,549.03
5. Step 5: Solve for x
   x = 30,872,549.03/6,621.72
6. Step 6: Final answer
   x = 4,662.32