Finding the Fourth Proportional to 13,404.15, 20,120.94 and 10,648.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,404.15 : 20,120.94 = 10,648.53 : x
2. Step 2: Convert to fraction form
   13,404.15/20,120.94 = 10,648.53/x
3. Step 3: Cross multiply
   13,404.15x = 20,120.94 × 10,648.53
4. Step 4: Simplify right side
   13,404.15x = 214,258,433.22
5. Step 5: Solve for x
   x = 214,258,433.22/13,404.15
6. Step 6: Final answer
   x = 15,984.48