Finding the Fourth Proportional to 13,196.84, 18,212.31 and 7,229.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.84 : 18,212.31 = 7,229.12 : x
2. Step 2: Convert to fraction form
   13,196.84/18,212.31 = 7,229.12/x
3. Step 3: Cross multiply
   13,196.84x = 18,212.31 × 7,229.12
4. Step 4: Simplify right side
   13,196.84x = 131,658,883.41
5. Step 5: Solve for x
   x = 131,658,883.41/13,196.84
6. Step 6: Final answer
   x = 9,976.55