Finding the Fourth Proportional to 6,600.72, 9,109.20 and 3,616.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,600.72 : 9,109.20 = 3,616.72 : x
2. Step 2: Convert to fraction form
   6,600.72/9,109.20 = 3,616.72/x
3. Step 3: Cross multiply
   6,600.72x = 9,109.20 × 3,616.72
4. Step 4: Simplify right side
   6,600.72x = 32,945,425.82
5. Step 5: Solve for x
   x = 32,945,425.82/6,600.72
6. Step 6: Final answer
   x = 4,991.19