Finding the Fourth Proportional to 39,318.54, 54,259.89 and 21,413.61

Step by Step Solution

1. Step 1: Write the proportion equation
   39,318.54 : 54,259.89 = 21,413.61 : x
2. Step 2: Convert to fraction form
   39,318.54/54,259.89 = 21,413.61/x
3. Step 3: Cross multiply
   39,318.54x = 54,259.89 × 21,413.61
4. Step 4: Simplify right side
   39,318.54x = 1,161,900,123.10
5. Step 5: Solve for x
   x = 1,161,900,123.10/39,318.54
6. Step 6: Final answer
   x = 29,550.95