Finding the Fourth Proportional to 13,191.78, 18,204.69 and 7,223.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,191.78 : 18,204.69 = 7,223.49 : x
2. Step 2: Convert to fraction form
   13,191.78/18,204.69 = 7,223.49/x
3. Step 3: Cross multiply
   13,191.78x = 18,204.69 × 7,223.49
4. Step 4: Simplify right side
   13,191.78x = 131,501,396.17
5. Step 5: Solve for x
   x = 131,501,396.17/13,191.78
6. Step 6: Final answer
   x = 9,968.43