Finding the Fourth Proportional to 39,864.15, 55,011.72 and 21,959.49

Step by Step Solution

1. Step 1: Write the proportion equation
   39,864.15 : 55,011.72 = 21,959.49 : x
2. Step 2: Convert to fraction form
   39,864.15/55,011.72 = 21,959.49/x
3. Step 3: Cross multiply
   39,864.15x = 55,011.72 × 21,959.49
4. Step 4: Simplify right side
   39,864.15x = 1,208,029,315.22
5. Step 5: Solve for x
   x = 1,208,029,315.22/39,864.15
6. Step 6: Final answer
   x = 30,303.65