Finding the Fourth Proportional to 13,188.50, 18,200.56 and 7,220.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,188.50 : 18,200.56 = 7,220.15 : x
2. Step 2: Convert to fraction form
   13,188.50/18,200.56 = 7,220.15/x
3. Step 3: Cross multiply
   13,188.50x = 18,200.56 × 7,220.15
4. Step 4: Simplify right side
   13,188.50x = 131,410,664.23
5. Step 5: Solve for x
   x = 131,410,664.23/13,188.50
6. Step 6: Final answer
   x = 9,964.04