Finding the Fourth Proportional to 38,705.50, 53,413.59 and 21,938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   38,705.50 : 53,413.59 = 21,938.50 : x
2. Step 2: Convert to fraction form
   38,705.50/53,413.59 = 21,938.50/x
3. Step 3: Cross multiply
   38,705.50x = 53,413.59 × 21,938.50
4. Step 4: Simplify right side
   38,705.50x = 1,171,814,044.22
5. Step 5: Solve for x
   x = 1,171,814,044.22/38,705.50
6. Step 6: Final answer
   x = 30,275.13