Finding the Fourth Proportional to 13,221.50, 18,245.67 and 7,632.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,221.50 : 18,245.67 = 7,632.50 : x
2. Step 2: Convert to fraction form
   13,221.50/18,245.67 = 7,632.50/x
3. Step 3: Cross multiply
   13,221.50x = 18,245.67 × 7,632.50
4. Step 4: Simplify right side
   13,221.50x = 139,260,076.28
5. Step 5: Solve for x
   x = 139,260,076.28/13,221.50
6. Step 6: Final answer
   x = 10,532.85