Finding the Fourth Proportional to 13,178.30, 18,185.54 and 7,209.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,178.30 : 18,185.54 = 7,209.82 : x
2. Step 2: Convert to fraction form
   13,178.30/18,185.54 = 7,209.82/x
3. Step 3: Cross multiply
   13,178.30x = 18,185.54 × 7,209.82
4. Step 4: Simplify right side
   13,178.30x = 131,114,470.00
5. Step 5: Solve for x
   x = 131,114,470.00/13,178.30
6. Step 6: Final answer
   x = 9,949.27