Finding the Fourth Proportional to 12,213.50, 16,854.72 and 6,624.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,213.50 : 16,854.72 = 6,624.50 : x
2. Step 2: Convert to fraction form
   12,213.50/16,854.72 = 6,624.50/x
3. Step 3: Cross multiply
   12,213.50x = 16,854.72 × 6,624.50
4. Step 4: Simplify right side
   12,213.50x = 111,654,092.64
5. Step 5: Solve for x
   x = 111,654,092.64/12,213.50
6. Step 6: Final answer
   x = 9,141.86