Finding the Fourth Proportional to 13,221.63, 18,245.72 and 7,253.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,221.63 : 18,245.72 = 7,253.31 : x
2. Step 2: Convert to fraction form
   13,221.63/18,245.72 = 7,253.31/x
3. Step 3: Cross multiply
   13,221.63x = 18,245.72 × 7,253.31
4. Step 4: Simplify right side
   13,221.63x = 132,341,949.89
5. Step 5: Solve for x
   x = 132,341,949.89/13,221.63
6. Step 6: Final answer
   x = 10,009.50