Finding the Fourth Proportional to 20,540.04, 30,648.72 and 19,286.16

Step by Step Solution

1. Step 1: Write the proportion equation
   20,540.04 : 30,648.72 = 19,286.16 : x
2. Step 2: Convert to fraction form
   20,540.04/30,648.72 = 19,286.16/x
3. Step 3: Cross multiply
   20,540.04x = 30,648.72 × 19,286.16
4. Step 4: Simplify right side
   20,540.04x = 591,096,117.72
5. Step 5: Solve for x
   x = 591,096,117.72/20,540.04
6. Step 6: Final answer
   x = 28,777.75