Finding the Fourth Proportional to 12,563.56, 18,815.40 and 7,003.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,563.56 : 18,815.40 = 7,003.12 : x
2. Step 2: Convert to fraction form
   12,563.56/18,815.40 = 7,003.12/x
3. Step 3: Cross multiply
   12,563.56x = 18,815.40 × 7,003.12
4. Step 4: Simplify right side
   12,563.56x = 131,766,504.05
5. Step 5: Solve for x
   x = 131,766,504.05/12,563.56
6. Step 6: Final answer
   x = 10,487.99