Finding the Fourth Proportional to 13,191.09, 18,203.72 and 7,223.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,191.09 : 18,203.72 = 7,223.12 : x
2. Step 2: Convert to fraction form
   13,191.09/18,203.72 = 7,223.12/x
3. Step 3: Cross multiply
   13,191.09x = 18,203.72 × 7,223.12
4. Step 4: Simplify right side
   13,191.09x = 131,487,654.01
5. Step 5: Solve for x
   x = 131,487,654.01/13,191.09
6. Step 6: Final answer
   x = 9,967.91