Finding the Fourth Proportional to 20,271.18, 30,405.27 and 7,123.68

Step by Step Solution

1. Step 1: Write the proportion equation
   20,271.18 : 30,405.27 = 7,123.68 : x
2. Step 2: Convert to fraction form
   20,271.18/30,405.27 = 7,123.68/x
3. Step 3: Cross multiply
   20,271.18x = 30,405.27 × 7,123.68
4. Step 4: Simplify right side
   20,271.18x = 216,597,413.79
5. Step 5: Solve for x
   x = 216,597,413.79/20,271.18
6. Step 6: Final answer
   x = 10,684.99