Finding the Fourth Proportional to 39,318.50, 54,258.72 and 21,413.82

Step by Step Solution

1. Step 1: Write the proportion equation
   39,318.50 : 54,258.72 = 21,413.82 : x
2. Step 2: Convert to fraction form
   39,318.50/54,258.72 = 21,413.82/x
3. Step 3: Cross multiply
   39,318.50x = 54,258.72 × 21,413.82
4. Step 4: Simplify right side
   39,318.50x = 1,161,886,463.51
5. Step 5: Solve for x
   x = 1,161,886,463.51/39,318.50
6. Step 6: Final answer
   x = 29,550.63