Finding the Fourth Proportional to 13,455.72, 18,568.42 and 7,487.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,455.72 : 18,568.42 = 7,487.64 : x
2. Step 2: Convert to fraction form
   13,455.72/18,568.42 = 7,487.64/x
3. Step 3: Cross multiply
   13,455.72x = 18,568.42 × 7,487.64
4. Step 4: Simplify right side
   13,455.72x = 139,033,644.33
5. Step 5: Solve for x
   x = 139,033,644.33/13,455.72
6. Step 6: Final answer
   x = 10,332.68