Finding the Fourth Proportional to 13,191.72, 18,204.50 and 7,223.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,191.72 : 18,204.50 = 7,223.28 : x
2. Step 2: Convert to fraction form
   13,191.72/18,204.50 = 7,223.28/x
3. Step 3: Cross multiply
   13,191.72x = 18,204.50 × 7,223.28
4. Step 4: Simplify right side
   13,191.72x = 131,496,200.76
5. Step 5: Solve for x
   x = 131,496,200.76/13,191.72
6. Step 6: Final answer
   x = 9,968.09