Finding the Fourth Proportional to 20,275.18, 30,413.94 and 7,128.46

Step by Step Solution

1. Step 1: Write the proportion equation
   20,275.18 : 30,413.94 = 7,128.46 : x
2. Step 2: Convert to fraction form
   20,275.18/30,413.94 = 7,128.46/x
3. Step 3: Cross multiply
   20,275.18x = 30,413.94 × 7,128.46
4. Step 4: Simplify right side
   20,275.18x = 216,804,554.73
5. Step 5: Solve for x
   x = 216,804,554.73/20,275.18
6. Step 6: Final answer
   x = 10,693.10