Finding the Fourth Proportional to 13,325.80, 18,390.50 and 7,662.42

Step by Step Solution

1. Step 1: Write the proportion equation
   13,325.80 : 18,390.50 = 7,662.42 : x
2. Step 2: Convert to fraction form
   13,325.80/18,390.50 = 7,662.42/x
3. Step 3: Cross multiply
   13,325.80x = 18,390.50 × 7,662.42
4. Step 4: Simplify right side
   13,325.80x = 140,915,735.01
5. Step 5: Solve for x
   x = 140,915,735.01/13,325.80
6. Step 6: Final answer
   x = 10,574.65