Finding the Fourth Proportional to 39,842.15, 54,981.72 and 21,936.69

Step by Step Solution

1. Step 1: Write the proportion equation
   39,842.15 : 54,981.72 = 21,936.69 : x
2. Step 2: Convert to fraction form
   39,842.15/54,981.72 = 21,936.69/x
3. Step 3: Cross multiply
   39,842.15x = 54,981.72 × 21,936.69
4. Step 4: Simplify right side
   39,842.15x = 1,206,116,947.31
5. Step 5: Solve for x
   x = 1,206,116,947.31/39,842.15
6. Step 6: Final answer
   x = 30,272.39