Finding the Fourth Proportional to 20,140.18, 30,078.56 and 17,146.71

Step by Step Solution

1. Step 1: Write the proportion equation
   20,140.18 : 30,078.56 = 17,146.71 : x
2. Step 2: Convert to fraction form
   20,140.18/30,078.56 = 17,146.71/x
3. Step 3: Cross multiply
   20,140.18x = 30,078.56 × 17,146.71
4. Step 4: Simplify right side
   20,140.18x = 515,748,388.40
5. Step 5: Solve for x
   x = 515,748,388.40/20,140.18
6. Step 6: Final answer
   x = 25,607.94