Finding the Fourth Proportional to 20,142.18, 30,081.55 and 17,148.71

Step by Step Solution

1. Step 1: Write the proportion equation
   20,142.18 : 30,081.55 = 17,148.71 : x
2. Step 2: Convert to fraction form
   20,142.18/30,081.55 = 17,148.71/x
3. Step 3: Cross multiply
   20,142.18x = 30,081.55 × 17,148.71
4. Step 4: Simplify right side
   20,142.18x = 515,859,777.30
5. Step 5: Solve for x
   x = 515,859,777.30/20,142.18
6. Step 6: Final answer
   x = 25,610.92