Finding the Fourth Proportional to 9,109.72, 13,656.66 and 4,423.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.72 : 13,656.66 = 4,423.15 : x
2. Step 2: Convert to fraction form
   9,109.72/13,656.66 = 4,423.15/x
3. Step 3: Cross multiply
   9,109.72x = 13,656.66 × 4,423.15
4. Step 4: Simplify right side
   9,109.72x = 60,405,455.68
5. Step 5: Solve for x
   x = 60,405,455.68/9,109.72
6. Step 6: Final answer
   x = 6,630.88