Finding the Fourth Proportional to 13,196.73, 18,211.50 and 7,228.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.73 : 18,211.50 = 7,228.77 : x
2. Step 2: Convert to fraction form
   13,196.73/18,211.50 = 7,228.77/x
3. Step 3: Cross multiply
   13,196.73x = 18,211.50 × 7,228.77
4. Step 4: Simplify right side
   13,196.73x = 131,646,744.86
5. Step 5: Solve for x
   x = 131,646,744.86/13,196.73
6. Step 6: Final answer
   x = 9,975.71